I've known some genuinely bad men... but none of them were incels. I honestly do not believe I have ever met an incel. I've certainly encountered them online... on Facebook and other social media platforms. I've seen videos on Youtube but as soon as I can identify them as what they are, I click the "don't recommend to me" button as fast as I can. Although, I have to say... it certainly seems like every time I block one on Youtube, the next time I login I get suggested 3 new ones. It's almost like interacting at all, even to block, triggers Youtube to put more in the algorithm!
I know these people exist... and I've met my share of bad guys in real life... but I guess I'm fortunate to have not encountered a true incel in the wild.