I think op is talking about the crazy reactions, like cussing and hitting. Which, if you've been online anything, especially gaming, is not shocking.
Surprise, a lot of gamers are assholes. And, I remember seeing a kid yell and hit his mom on the trolley in Philly back in the early 90s. This ain't new. Some parents don't discipline their kids. They see evidence to not spank kids as evidence to not discipline their kids. My 6 year old threw a temper tantrum last night while we were out at dinner. That shit ended real quick with no spanking. But it's hard.
If I did that to my 14 year old, he would laugh. Hell, we always interrupt him and tell him to turn it off at a bad time.
Teach your kids playing vg are a privilege. You are only guaranteed a place to sleep, heat, clothes and food. Healthcare. Going to school. I think that's it.
Cars, phone, i whatever, vg, even the chance to go out with friends... You gotta earn that shit.