I can't really imagine myself being a parent. Like, at all. But if something like that were to happen between me and my child, I'd probably just say 'it figures'. =/ That's the kind of stuff I get in my life...
I don't think I would bother too much with a kid who grew up to be a jerk...unless they tried to mooch off me or worse. I'm not the kind of mother who'll ignore criminal activity or violence; I'm not even the kind of sister who would ignore that. Hell, I'll call the police on you myself.
People tend to think they can walk all over me because I'm the kind of person who runs away from problems...but when those problems start trying to follow me around, you will see a side of me that you won't be prepared for. My peace of mind is my most valuable possession, and I will go to great lengths to protect it; 'family' be damned.
...Anyway, from the 'child disgusted by parents' POV, I'm already kind of there...it's not so bad that I hate my parents and/or don't want to associate with them, but it is at the point where I feel like I'm better off living on my own and staying in contact by phone, despite the fact that I'm still kind of dependent on them. It's this specific amount of distance that makes our relationships optimal...any closer and we'll start getting into fights. ^^;