He's implying that it is sexist to be bad at talking to women.

Really? Re-reading it with that in mind, I think you're right... I guess my brain presumed that was such an irrational conclusion to draw about me after reading what I wrote that it didn't register at all, I honestly thought I was just not understanding what the poster was trying to say.

It really feels terrible to be insulted when I was trying to contribute a thoughtful comment.

IMO it's a ridiculous allegation, anyway. Guys aren't bad at talking to women because they want to be, so telling them "Hey that thing you're ashamed about, well you should feel even worse about it now" isn't useful.