I agree with both of my future fellow mods. I hope Matthias stays, at least as a poster, because he really HAS contributed immensely to this site over the years, and is one of the most distinguished members in the history of the site. Not to mention his passion for volleyball, which after all is the purpose of this forum.
But also, people can't use "get a sense of humour" or "it was just a joke" as a shield to throw shit at other members. There will be certain lines, the crossing of which simply won't be covered by "freedom of speech" argument (have you ever heard of the concept of "hate speech" and that people irl are not allowed to say literally anything they want under the cover of "freedom of speech" without consequences?).