I had incel like behaviour for a while when I was younger I had a pretty normal family and upbringing, but I spent a lot of time online I really resonated with the "nice guys" memes of the late 2000s - I genuinly believed that I was really nice and that no one saw it because they were "sluts" (which they totally weren't and it's shocking that I thought that) and that they only liked guys who were sporty I was good in school, I got good grades and I think I leaned into the trope shown in media where the smart guy is always a jerk, so that didn't help I had nerdy hobbies too and would assume women in those spaces were fake nerds, when really they were more nerdy than me!

I'm so glad I matured out of that headspace, I hate the person I was - but tldr I think the nice guy memes were a big influence, and while they're not as widespread now, they are on some corners of the Internet