Maybe kids are meaner now, but in my day, your parents' shit was your parents' shit. It wasn't "off limits," it just...wasn't used. Granted, I grew up in a schmancy suburb, and the "shit" in question was, like, the dad going to Club Fed for insider trading. One classmate's dad left his mom and came out; that was a conversation-stopper back in the '80s. And then there were certain...other parental occupations...that you weren't going to clock anyone for in North Jersey, IYKWIM.
I'm not saying it doesn't happen or didn't happen, and my school was not typical for a number of reasons, but I do still think the incidence is far higher and more severe in fictional narrative than it is IRL.