The internet is full of questionable jokes. Gay is a generic negative adjective, in gaming circles rape is used as a term for defeating your opponent, and many people enjoy some sexist and otherwise disparaging humor.
When people, especially moderators, step up and try to ask to skip these phrases, they are generally met with dismissive reactions. Can’t they take a joke? No one’s being hurt, it’s their fault if someone is offended – after all, it’s just words, right?
Sadly, that’s grossly underestimating the power of language and interaction.