As for the T-shirt thing. I can see both sides. On one hand, it symbolizes how uninviting the STEM disciplines are to women. It's a tiny ugly thing that represents the struggles that you're going to have to overcome to be a woman in science. It's not even a conscious thing for the dude; it's a product of our underlying sexism in society.
On the other hand, it's a fucking T-shirt. One that was made by a female friend and that he was proud(?) to be wearing. As a scientist, one of the best things about the job is that most of the time you get to wear whatever you want. People in our lab wear goofy clothes or shirts that have text like "Fuck like thunder" on them. It was an honest mistake and is probably more tacky to wear to an interview than anything else. My boss, a female scientist who definitely acknowledges there was a lot of sexism against her as she worked to get to where she is, thinks it's funny and that he's just a dork.
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