People with different values and living situations can understand each other if they want to. It is factually true that after the age of majority, family relationships technically become optional. Burning bridges for petty reasons or annoyances would be a terrible idea: there's no one like family.

I've befriended a few sane, educated, elderly homeless people.

Turning your back on your parents if they haven't done anything "wrong" would be coldly, cruelly throwing them away like garbage. That's what happened in Korea and the suicide rates are awful. It's disgusting and embarrassing.

In my case, I haven't talked to my father in 25 years because he is very much a petty, unstable, irrational, unforgiving, un-empathetic, pathetic, unreasonable, hateful, venomous narcissist no one likes, my mother escaped, and he browbeat his late parents to take all of their money when my mother (their nearly adopted daughter/daugther-in-law) needed it more. If it weren't for the terrible way he treated people and the terrible things he's done (like molest my cousin), I would at least still want to know him.

I'm close to my mom.