Perhaps your wounding is misplaced here, as the text you cite is a quote from a movie I believe you'd enjoy quite a bit. That particular quote was from a doctor, and was his official diagnosis of the hero of the movie, who was the smartest man in the world.
I expected @madalchemist to be aware of the quote based on my understanding of some of his statements. You may not be, and you may also not care. Your own particular bias is on display here far more than any you might ascribe to me. I am not averse to pejoratives such as fag, retard, cracker, drunk, and etc. being applied to me by others.
There's no point in defending myself from insults. If they're not true, I have no need. If they are, nothing I say will change that.
However, to object to the pejorative fag on one hand, and then to justify retard on the other is not only void of substance, it is simply narcissism, only defending your person, and not other people who have no less right to be offended than you by specific epithets.
I don't care what you call me. I can only be what I am, and if you accurately describe it, that's fine. Your sexual proclivities have not been addressed by me heretofore, and won't be. You will note my comment was not addressed to you, and that is why. I have no interest in trying to belittle people for no other reason than that it can be undertaken. You'll note all my comments to you advocate for what I expect are meaningful reasons. Personal sexual preferences are not amongst those reasons.
tl;dr this was a quote from the move 'Idiocracy' addressed to the smartest man in the world, and not a sexual slur.