Why do blue pill advocates react so strongly when their beliefs are questioned?

Hello,

Hoping this one meets community standards, last post got removed for the wrong flair. My question is this:

I made some comments in a balding subreddit suggesting men who go bald young will likely face dating challenges if they aren't otherwise uniquely attractive, as many young women aren't interested in bald men. What I got in return was hatred, vitriol, and opprobrium. I had to block some crazy people. Why is this? It's like being a heretic in the 1400s. If I had a dollar for everyone who called me an incel I could buy a house in today's economy.

When you challenge red pill ideas it seems they just try debate you or at worst call you an idiot. What drives this very noticable difference in reactions?