I'll tell you what will happen if you bring up John Money, his criminal actions, and his position as the father of modern gender theory in a discussion with a leftist.
In my experience they do their utmost to disassociate him with their beliefs on gender and try to minimize his part in creating the ideology they choose to believe/partake in.
If you don't let them casually dismiss him, they tend to become irrationally angry and accuse you of transphobia.
Happened here quite a few times in the past.