The reason tech bro trolling works, even if you are astoundingly egregious about it, is internalized misogynistic presumption of incompetence.
If a guy makes a joke about Linux, open source, whatever, that's really painfully obvious they're pretending to not know what they're on about, they're not likely to get many responses confronting them. Even if they seriously don't they often don't. Someone hyperfeminine? There's no fucking way they could know what they're talking about.