Different context, different politeness rules. I bet you're fun at parties. An online forum is a relaxed space, like a town pub. HR isn't breathing down our necks here. Personal attacks are a different sort of thing. Using a word to describe in a comment some abstract situations and kinds of characters you see at the office is not a personal attack.

There is not one single discourse norm to rule them all and calling out every little thing as too offensive is just annoying. Yeah, yeah there are no midwits, everyone is a unique little genius flower, yeah.