The pun is that "fanboy" encapsulates "not a man" (boy). Of course the archetypal fanboy or hater is kind of a weakman (if not quite a strawman), but that's the

The pun is that "fanboy" encapsulates "not a man" (boy). Of course the archetypal fanboy or hater is kind of a weakman (if not quite a strawman), but that's the point; it's a model. He's pointing out that in that model, the "boy" is very relevant and indicative. If he were discussing the word "fangirl", he'd probably say "not a woman" instead, but I think that would result in more flak ("as a mam, who are you to judge if a woman is a real woman or not?"). I feel like a lot of the posts in this thread are missing what he's actually trying to say here.