Only 5.3% of US welders are women. After years as a professor, I became one

Shop talk and banter are fairly universal. Any difference is going to be a target. Thin bloke who doesn't look strong enough? Ginger hair? Tall guy, short guy? Weird tattoo, etc. Definitely the one black guy or the one white guy is going to get shit. But is it malicious? Almost certainly not.

The other thing, which in my experience is relatively common worldwide, is that working class communities are more accepting of male-female dynamics. In academia and in highbrow society the tendency is to basically sanitise every social interaction. When you're in an environment where that isn't happening then you can't suddenly ignore it any more.

There's a lot of actual prejudices (not just banter) among, say, "educated" tech industry workers, too.

Including sexism, racism, ageism, and classism.

Most people will at least superficially hide it in modern workplaces, but it's still there, and having effects.

You've probably seen evidence of this places you've worked, and you can also see it often in pseudonymous HN comments.