4chan is an anonymous imageboard similar to this one. The main difference is that this board caters to a very small and extreme fetish that isn't accepted openly in almost all other social media platforms.

If people browse 4chan despite there being plenty of other platforms that cover the general genres that 4chan does then it is because they do not want to post under a given name. This means it will naturally appeal to a certain kind of person who wants to say things without any kind of repercussions or it being brought up in the future. You're naturally going to get more socially reclusive "jerks" on 4chan.

Just my opinion anyways. You learn to deal with the culture there eventually.