If a dev made a whole thread regarding a topic they've been struggling on and you would have a non-dev trying to suggest things without any "real" background. No matter how much you've "analysed" games, implementing and workout out a product is different.
Otherwise any game reviewer would be able to step into game studios with their pluses and minuses and tell those devs what to do.
It doesn't even matter male or female.
That's why GDC is so great, because devs would be able to talk to their peers.
When the dev is wanting a reaction from the community, thats the moment you can jump in with your thoughts.
Also the guy wasn't even providing feedback, but he was disagreeing and telling she wasn't thinking about the problem right and that it was solution lies elsewhere. No matter how much you sugar coat that, to just hear that from someone with no real writing background is shitty.
It would've been better (looking back at it now) that she left it at that, but sadly that imploded to the mess that it is now.
If you're willing to partake or start a discussion, come with discussion points and not a paragraph on twitter (the worst medium to have discussions).