[Maédhros]

I would say that Orcs are definitely more easy to say that they hate the most. They were a race created to fight both elves and men. They were perversions of them.
In the sil, we can see that elves and men have this capacity too.
Orcs have the excuse that they were mutilated by Melkor, yet the elves and men no.
We see for example, Saeros distrust and loathing of Turín. Maeglin dislike of Tuor and we see the great loathing that Maedhros had against those of Thangorodrim.
I think that they all have a great capacity for loathing, the more brighter the spirit, the more the capacity to hate.
Look at Galadriel, she didn't like Feanor, she in fact hated him. And that was in paradise, in Valinor. Hate doesn't know places or race. It's just it.