there is nothing wrong or extreme about the concept of "free speech"
allowing people to talk shit on your own physical property or website has nothing to do with free speech
forbidding other people to say something in general, by law or other measurements is something a modern free society should look down on
it's the most basic tools to expose and to stop an oppressive and/or evil government/institution
If you don't like what people say, have you ever tried going out of their way? There are a lot of people in the world, you don't need to try to be friends with everyone. And you will surely not make yourself very likeable if you run around trying to take away people's voice.
I think the more popular a platform becomes, the more it has to hold up the values of free speech, especially when your own country benefited from this concept for centuries. That's why people look down on how the owners of Twitter and Facebook are behaving.
"wirechan.org" is a smaller website and I think it's perfectly fine to have a couple of rules, to behave nicely
freedom of speech exists to allow people to express their ideas freely without giving anyone the ability to shut you up, just because his opinion differs from theirs
Only by hearing many _VERY_ different opinions, can a society come to a good and healthy consensus.
If half of the people aren't allowed to give their honest opinion, any consensus formed will be very shaky as if it would only stand on one leg.