cats

I mean, we can only go off of what is presented in the story, while acknowledging it's 4chan and therefore both fake and gay. Within that frame, the new guy has been tagged with a nickname, he has mentioned to his colleagues that he'd prefer they not call him the nickname, and they are continuing to call him the name he's expressly said he'd prefer they didn't use. That's a textbook hostile work environment, at a minimum.