I thought it was obvious Orodreth was the one with the least friendly feelings towards his Fëanorian cousins (or really, any of his Noldor side). He is the only one to speak with her father against Fëanor in the plaza of Tirion (and omg the amount of courage that must have been to go against the popular mob and his oldest uncle and prince who’s waving around torches and swords and inflaming the crowd). Unlike Angrod and Aegnor, there’s no discarded draft version where they were closer friends with Fëanor’s middle sons, nor does Orodreth go like Finrod on hunting and camping trips with Turgon, Maedhros, or Maglor. He isn’t Aredhel or Fingon. Either we have a generation gap with Orodreth as Angrod’s son rarely in the company of his cousins – or Orodreth was not close to and had no desire for closeness with any of that side of the family.

Orodreth’s chosen land holdings are close to his brothers and King Fingolfin. He follows the lead and example of his brother Finrod and King Thingol. He was the one to side with his father against the Noldor Rebelllion in the first place  He specifically cites Finrod’s trusting and forgiving nature and his desire to be morally clean as to why he allows Celegorm and Curufin to leave Nargothrond with their lives instead of allowing mob-driven capital punishment. 

About the only time I see evidence purported for a friendly relationship between Orodreth and Celegorm & Curufin is that the two rescued Orodreth during the escape from Tol Sirion. But there’s no evidence of this in any draft I’ve found yet. Nor does it make sense in the timeline unless we have perfectly contrived timing. 

Curufin and Celegorm flee west during the Bragollach when Morgoth’s armies attack, having been cut off from Himring and all their brothers’ territories to the east. The  impression from the text on whether the fiery assaults on Hithlum, Dorthonion, and down the Gap of Maglor were simultaneous or a rolling campaign going west to east is ambiguous, I think, but the adjective of Sudden and how caught unawares the Noldor were makes a strong case for attacks all at once at the various locations instead of each of the border regions either holding out or falling one by one. We know Fingolfin rides out to his duel with Morgoth after he hears that Dorthonion has fallen and most of the sons of Fëanor driven from their lands. Celegorm and Curufin are fleeing or have already fled to Nargothrond by the time Fingolfin rides north, which is counted the post-script to the Fourth Battle. We know Orodreth holds out in Tol Sirion for two years after the Fourth Battle – which makes perfect sense, as if that pass had been taken and thus orcs free to cross in Dimbar and the plains west and south of Brethil (which they will), then it becomes all that more difficult for Celegorm and Curufin to safely make it all the way to Nargothrond. Unless it took two years for Celegorm and Curufin to cross the Dungortheb and the road through the Crossings of Teiglin down to Nargothrond, being on the road at such a late date to meet up with Orodreth’s forces as they are fleeing Sauron south from Tol Sirion on their own escape to Nargothrond, the events are separate. Celegorm and Curufin’s forces arrive in Nargothrond a few weeks or months after the Dagor Bragollach, possibly right before or after Finrod returns from the Fens of Serech trying to rescue his brothers. That Orodreth is holding the siege lines at Tol Sirion is a key reason why the Fëanorians can arrive safely to refuge with Cousin Finrod. About a year to a year and a half later Orodreth and his refugees arrive at Nargothrond to find already there and highly treated the cousins he had actively spoken against in Tirion and who we know via Caranthir and Angrod have some bad blood and feelings lingering (And if Curufin is his father’s strongest supporter e.g. Losgar, then Orodreth is for Finarfin). That Orodreth could feel resentful of these arrivals before him taking time and resources away from the brother he clearly admires, who won’t even be there if not for him, seems more natural, especially if it is built upon old underlying animosity. We know Curufin especially will try to jockey power and control in Nargothrond to what he sees as the rightful (i.e. older) branch of the Noldor royalty – namely away from Orodreth. He calls Orodreth a dullard, and there’s far more evidence of a contemptuous and antagonistic relationship between them than anything else.

(So for head-canon we can suggest that Orodreth as son of Angrod picked up his father’s not-quite-feud with his Fëanorian cousins, or that Orodreth was particularly close to his Teleri cousins of his mother’s side, or just that the Kin-slayings that obviously and naturally affected the sons of Eärwen were harder for Orodreth to forgive than Finrod, or Orodreth knew of how little his cousins thought of his intelligence and bravery, or blamed them for why he was even in Beleriand when he didn’t support the idea in the first place – which begs the question of his loyalty to Finrod outweighing everything else?- or they were rivals in Nargothrond for influence and power long before and especially during and after the coup d’état or all or the above).

And for quote quota: 

“There now arose a growing storm,
a clamour of many voices loud,
and folk whom Curufin had cowed
and their own king had help denied,
in shame and anger now they cried:
‘Come! Slay these faithless lords untrue!
Why lurk they here? What will they do,
but bring Finarfin’s kin to naught?
Treacherous cuckoo-guests unsought,
away with them!’ But wise and slow
Orodreth spoke: ‘Beware, lest woe
and wickedness to worse ye bring!
Finrod is fallen. I am king.
But even as he would speak, I now
command you. I will not allow
in Nargothrond the ancient curse
from evil unto evil worse
to work. With tears for Finrod weep
repentant! Swords for Morgoth keep!
No kindred blood shall here be shed.
Yet here shall neither rest nor bread
the brethren find who set at naught
Finarfin’s house. Let them be sought,
unharmed, to stand before me! Go!
The courtesy of Finrod show!’
In scorn stood Celegorm, unbowed,
with glance of fire in anger proud
and menacing; but at his side
smiling and silent, wary-eyed,
was Curufin, with hand on haft
of his long knife. And then he laughed,
and ‘Well?’ said he. ‘Why didst thou call
for us, Sir Steward? In thy hall
we are not wont to stand. Come, speak,
if aught of us thou hast to seek.”
Cold words Orodreth answered slow:
‘Before the king ye stand. But know,
of you he seeks for naught. His will
ye come to hear, and to fulfill.
Be gone for ever, ere the day
shall fall into the sea! Your way
shall never lead you hither more,
nor any son of Fëanor;
of love no more shall there be bond
between your house and Nargothrond!’”