The thing is, saying something like, "There is no such thing as a sane transgender person," is not inherently hateful. It is not. It's a statement of fact. Sure, plenty of us spout some pretty edgy shit about transgenders in general, but that does not invalidate the fact that transgenderism is inherently disordered, and it should be discouraged just as heavily as behaviors like anorexia or bulimia. It's also not hateful to point out that transgenderism itself is dehumanizing.
It's not hateful to point out the antisocial behavior of most transgender people, and it's not hateful to point out the fact that even "sane" transgender people does not redeem the concept that we should play pretend with people who are convinced, with every fibre of their being, that they are something that they are not, and will never become. That permanently damaging your body, your ability to reproduce, and your ability to have normal, healthy sexual relationships with others, is ever a good option. Hell, it shouldn't even be a last resort.
If anything, invalidating transgenderism is actually the compassionate thing to do. Make it illegal to change your legal documents to reflect your gender identity rather than your biological sex. Make it illegal for doctors to attempt to medically "transition" you through chemical or surgical means. Make it easier for your loved ones to have you committed if you refuse to stop playing pretend as the opposite sex, and ESPECIALLY if you lash out at others who refuse to play along.
Aside from the fact that it's easy to hate these people for the horrible, awful things they do to those closest to them, and to society at large, taking such a stance doesn't make you a bad person. If anything, it makes you a kind, compassionate person who cares for the well being of others.
The fact that some transgenders can feign sanity does not change the fact that transgenderism is an inherently self-destructive delusion that also comes with anti-social and narcissistic behaviors as biproducts.
All intersex people are male or female.
Get back to me when a person is born who can produce both eggs or sperm, or even a sperg cell.