I think we're evaluating the circumstances with different criteria. You're looking at the story and relating it to a thin-skinned woman who can't handle non-politically-correct humor in the workplace. I'm relating it to a 16-year-old kid who hasn't had the time or experience necessary to develop the thick skin and snappy retorts that would shield her from her peers' disrespect. She's not getting passed up for a promotion; she just wants to learn programming. It's entirely within the job description of a teacher to notice, step in, and set standards for behavior in the classroom. Even when they're not met, they communicate more than tacit acceptance of bad behavior.

I completely agree that people in general, and women in tech specifically, have to be thick-skinned to survive professionally. Nobody's advocating HR thought police--they'd be unnecessary in this case anyway--or politically-correct automatons. We're talking about kids. Kids! Surely it's not totally out of line to suggest that they could learn better behavior than "get in the kitchen and make me a sandwich". Surely there's a better response to the whole situation than "that girl needs to suck it up and learn how the world works".

For what it's worth, I remember the first time those trite cliches were thrown at me, and they felt neither trite nor cliched. They hurt. I thought I was part of a team, among equals, brothers-in-arms, friends, and I wasn't. I was different, I was other, I was less, I was not welcome. It's a paradigm shift that happens in an instant, and it can be pretty shattering--great for killing enthusiasm and developing thick skin in the future, maybe, but not for learning things in a programming class.