[Loslote]

Also, just by looking at some of the names the Eldar give to the Edain: Firimar, the sickly ones, comes readily to mind; also the Atani, the Second People. Yes, Atani describes a true aspect of Men, but Firimar doesn't seem to be entirely necessary as a descriptive name.

I think the Eldar naturally felt superior. Their attitude towards the dwarves, for example, was almost always condescending and arrogant. Celeborn disliked them on first sight, going so far as to refuse to pass through Khazad-dum in one version of The History of Galadriel and Celeborn. It does seem natural that this discrimination should apply to Edain as well.