Mumei's argument was basically that not wanting to fuck dudes made you a bigot.
It's not the single craziest Social Studies Warrior argument I had ever seen, but it's up there.
Also, giving someone AIDS on purpose is terrible and such an action warrants prison so the crazy fucker (pun not intended... I think) doing it is stopped. Even if the incident rate is low, there's nothing inherently wrong with a criminal law that doesn't see much use.
Transgender women are women
AIDS is not HIV.
But I know where arguing with you goes -- endless tedium.
"Transgender women are..." folks who if you want to have sex with, more power to you, but a lot of dudes don't want to, and that's okay, and not rationally worthy of condemnation, in the same way wanting to isn't. Mumei's argument was that not wanting to fuck humans with a Y chromosome is to be bigoted against them.
Also, semantics about HIV and its end stage does not help produce a counter argument to the moral, civil, and criminal liability of deliberately infecting someone with a disease that will eventually kill them and in the meantime require exceedingly expensive medications for the remainder of their life.
HIV is not a disease, the semantics between it and AIDS is relevant. AIDS is difficult to acquire unless you seek no treatment and your immune system buckles to the infection.
HIV, and even AIDS, rarely kills people in western countries with access to medicine. The medicine itself is available to those without the funds to acquire it, through subsidized insurance plans and state healthcare options.
So no, you are wrong here.