Funny thing is ... straw or not ... that's exactly what happened. I say the joke was spot on.

Aha.

Please, can you show me where in the thread someone called the author a patriarchical pig? Or something comparably insulting?

So the joke is discrediting feminists by putting the word pig in their mouths. (If that was the intent of the joke, one can discuss - well, if one is able to discuss)
People complain, without insulting.
The joke defenders:
insult the ones who complain,
tell them how they have to feel,
and in the end make that a proof that the joke is actually right.

I'm missing that proof.