Families - are you aware not every family is like yours?

I've noticed something - many people appear to see their own experience as the same for everybody else. In this case - let's say you have an amazing relationship with your parents, so you act like everyone else is the same with their parents and appear to have difficulty in listening to people speak bad about their parents and even get "pissed" at them for it. I find this ridiculous. I'm pretty close to my mother and I don't even remember a time where I thought every other mother was like mine. That makes no sense to me.