I've seen them claim that LGBT MLs are as misguided as jewish white supremacists, saying that oppression of gays is an inevitable result of "authoritatianism".

To be honest, I don't think people generally respect this kind of "argument from representation and support within community" you are going for. Like 80% of anprims/anticivs on twitter are trans for some reason yet other anarchists have no qualms about calling them forest TERFs.