Some people had the norms change out from under them. In the past the societal norm was that Women were supposed to be shy and demure and pretend to be uninterested in sex. The men were supposed to take charge and "conquer".

Nowadays we know this is dumb and causes tons of unwanted harassment. People changed and made the world a better place, which was great. Then we went back and started prosecuting people for doing what they were told they were supposed to be doing at the time. This is why we have grandfather clauses in the law.

The difference between Sexual Harassment and Flirting is if the other person is into it.