You know what discrimination is when you see it. It's a worker getting fired because of their age. It's a promotion going to a man over a more-qualified woman simply because of her gender. It's a company giving all of the less desirable jobs to workers of a certain ethnicity.
The unfortunate reality, which has become more clear in recent years, is that workplace sexual harassment seems to be common in almost every single industry. If you thought there was a stereotypical industry that contained most harassment cases or that there were "safe" industries where that sort of thing did not happen, you're probably wrong. It can and does happen anywhere.