Owner of the server in question here. I tend to allow such content with the intention that it would help keep the trolls/immature people out of the more serious servers. I very rarely actually play the game myself since I'm very busy so there is little moderation that I personally am capable of, although when I do see egregious behavior (such as swastikas being drawn all over the place) I do remove them.
With that being said I am open to guidance and suggestions from the community if more moderation or content rules are warranted.
Curiously enough I actually have attempted to implement wordfilters in chat, but they were easily bypassed via the use of non-Latin characters or the insertion of {} into text which changes the word but doesn't displace any of the text.