I assume you are meaning, here, as a PC race?
So I did select drow. LUVUM for villains, nemeses, evil-doers in the darkest reaches of the Underworld. But PCs? Nuh-no. Hordes of broody emo outcasts, no matter how good they look in black, are not racing up out of the Underdark to be valiant heroes on the surface. Just...no.
I selected Warforged, but it's not exactly a "hate" so much as a "setting appropriate" thing. Warforged are and belong in Eberron. Since I do not play in the Eberron setting/world, warforged have no business being PCs in my games.
Dragonborn...well...just don't like 'em. No sir, I don't like 'em. They're "forced" in a way? Or "hokey"...I can't really tell you why. Just don't.
Eladrin is missing from the list, so I clicked on "Other half-races or planetouched" for them. Gods I HATE the whole concept of "Eladrin." There were always...ALWAYS ALWAYS...from 1e on down "High Elves"...they were the friggin' DEFAULT elvin race for PCs! There were also "Grey Elves" which were supposed to be more "magical" and "otherworldly" and "removed/reclusive". Why in the world did "Eladrin" ever strike anyone as necessary?! If I had to pick ONE race for pure "hatred", it would be the "Eladrin."
Tieflings, Aasimar, Genasi and other "planetouched"...things...I just have a problem with.
Mostly, this is because if I allow it for one player, then it's fair game for all (and me as the DM for NPCs)...and having horned n' tailed guys, girls with flaming or blowing hair all of the time or shiny glowy folks with "angel eyes" just rubs me...in a not good way.
More than ONE of these, not just in the party, but in the whole of the Prime Material Plane just strikes me as ridiculous. Ok, maybe one EACH.
AGAIN, though, it is a setting specific thing. If you're playing Planescape or in Sigil or playing a "racing across/through the planes" campaign or "make a party of extradimensional characters starting off in the 4th Level of Hell or the Astral Plane" kind of game, then they make total sense. Just not in my "standard" setting/world (which I think/take as a fairly "vanilla" standard fantasy D&D world).
I mean, c'mon, how many angels, devils, elemental/djinn, etc. ad nauseum are havin' sex with normal mortals (most probably humans)?
All of that said, I would be inclined to allow any or all of these races as a SINGULAR, ONLY ONE OF THEIR KIND IN THE KNOWN WORLD kind of thing if the player reeeeally couldn't do their "character concept" any other way. But, it's been my experience, that there's pretty much always another way to do them with a more..."conventional" or "traditional" race.
Nuf sed by me. Going to my bunker now to wait out the inevitable fallout.
--SD