Honestly, I hear the most extremist talk from people who don’t actually know what they are talking about and are partway psycho. Lots of them know nothing about either extreme you’re mentioning, radfem or queer theory, and haven’t bothered to learn about any of it, yet still manage to projectile vomit their opinion all over forums. That is a worse look than someone who has taken the time to figure out what they are supporting or condemning. Any extreme nutcase stuff is bad news.