It's all in the wording, but I think it's also the contradiction between the first and second/third sentences.

Yes yes, intelligent woman be intimidating to some people.

Acknowledges that intelligent women are intimidating to some. It also uses present tense, which implies the author knows this is still the case.

But how old is this, is it still that bad? The "computer girl" could be around 2000.

Ah "it". Which it? That some people are intimidated by intelligent women or that the author encountered a ton of sexism?

I think it's ok to ask how prevalent sexism still is these days, especially if you personally experience it / don't participate in a field dominated by the opposite gender.

Something like "I thought society would have finally realized this behavior wasn't appropriate after me too, is that not the case?" sounds less tone deaf.