The funniest bits about this sort of argument is that I often see people become completely estranged from their parents because the attitude of 'I need my children to take care of me when I'm older' is like a package deal for a whole host of other shitty behaviors.
Oh I mean you have an obligation to be a parent that your kids would want to take care of.
I don't talk to my parents and have no interest in taking care of them, because, like you said, they are horrendous people. I think you're right that the entitlement to your kids time is something that comes with poor parenting.
That doesn't mean that on-net people's kids won't take care of them. Like everything with your kids, it's a two way street.