One lunatic claiming he is a god is a problem for that lunatic and a few others who interact with him. 50,000 people claiming the lunatic is a god is a problem for a whole lot more than 50,000 people.
what's the hypothetical "worst case scenario"
for people "misgendering" themselves ?
I think we've seen it at the worst it's going to be:
A) People attracting homosexuals, then rejecting them because they claim to be heterosexual (even though they are in reality seeking a homosexual relationship)
B) People (especially children) being sterilized and then later realizing they wanted biological children and can barely attract a mate much less pass their genes on.
C) Families being broken up by a disagreement over gender identity
D) People killing themselves for reasons (A), (B), and (C).
E) Governments stealing from others to perform cosmetic often sterilizing medical procedures on others
F) Governments threatening force against people who build only two variants of restrooms or insist on holding to the original/correct definition of gender
G) Women's sports leagues being destroyed
H) Hyper paranoia leading to baseless lawsuits claiming discrimination and wrongful termination
I) Women being frightened or made uncomfortable by males entering their private spaces
I.1) People actually being raped by males using the public fear of the cult to enter women's spaces as actually happened in a Virginia school
I.2) People actually being raped by males using the delusion to enter female prison populations
J) The biggest one in my opinion is the backlash all the previous are creating. The pendulum is coming back and the momentum that is building is itself a return to previous irrationality.
Since J is happening, I think we've seen the worst.
If you're asking about how bad it could be in other circumstances, I've said many times that the delusion of humanity is unbounded. If I were to say there was a society that brought men to the top of a step pyramid and declared that since the male was truly a female, the penis is a demon in disguise and when they cut it off he won't bleed to death unless he lacked faith; that would not be something you could honestly say is impossible for humanity.