This strikes me as an artificial limitation on the subject under discussion, which is "why do only half-races have a negative portrayal?" It's not an issue of PC races only (of which orcs are typically presented as a PC race in a subsequent supplement anyway, and will be in the Revised 5E PHB).
Tieflings are a mixed heritage race.
One which doesn't have "half" in their name, and which were usually described as being looked askance at for their fiendish ancestry. But that, like so many other negative qualities, has been quietly shuffled out the door in the name of being inoffensive.
Only drow are the odd one out really. And, frankly, that's because drow have all sorts of other issues as well.
It's the same issue. That a negative in-game depiction is taken as being representative of, or an unbearable reminder of, real-world bigotry. So that was removed, leaving them anodyne.
Again, I'm talking about the Player's Handbook here. What sources are you talking about?
Leaving aside that tieflings and drow are in the 5E PHB, and orcs will be alongside them in the Revised 5E PHB, I'm referring to (PC-playable) races in general. I'm not sure there's much merit to limiting things to the PHB, but given that the orc will be there in less than eighteen months, it's kind of a moot restriction anyway.
I'm frankly finding it rather baffling that asking that we not include the same language that real world bigots use to describe and treat people in the PHB is considered a big ask.
This again? Yes, it's a big ask, because it's so expansive that it encompasses literally all possible negative characterizations of a particular race, since every negative quality imaginable has been used to describe some ethnicity at some point. Saying "no language reminiscent of real world bigotry" is the way you excise all negative chararcterizations altogether. It encompasses calling orcs savage and brutal. Calling kender kleptomaniacs. Calling drow treacherous and deceitful. And on and on. That "ask" (which is usually framed as a demand, with the underlying implication that there's no acceptable reason for refusing) is reasonable only in how it sounds, not what it wants.
Do you remember when I pointed out the way that Dragonlance's draconians can be read as
using the language of bigotry with regard to people of African-American heritage, and you said
"let's agree to disagree" because it was "reaching pretty hard" with regard to it being offensive? That's how a lot of people feel with regard to orcs, drow, tieflings, half-elves, etc.