Some years ago, I was at a con with my little circle of nerd-type bros. We stopped outside of our hotel to drink our weeb sodas and, somehow, this odd-looking fellow gets roped into our conversation. Being young and dumb, we invite him up to our room to talk some more and watch some anime I could tell was pretty bad, even back then.
As time went on, so the dude got creepier, leering at and hitting on my (lesbian) friend, and making generally terrible comments near-constantly. But, young and dumb as we were, we didn’t kick him out until he suggested I make out with my little sister, who had also come along, because “it would be yuri and incest at the same time”.
Yes, he actually said that. I think I was fifteen or so at the time.
During the following years we’ve seen him a couple times at the same con, always taking care not to get close enough that he might recognize us.