I’d say largely depends on the severity of the parental transgression, and the degree of harm that resulted. As well as the type of relationship you wish to have as adults.
Most parents (not all) generally try to do a pretty good job. Sure, most parents fuck up along the way, but some kids contribute to fucked up household situations as well. If the parental action was short of abuse, and if the kids matured into reasonably well-functioning adults, as a general rule I suggest it is not terribly productive or kind to repeatedly throw remote resentments in your parents’ faces.
If you are that pissed, then maybe you should restrict your interaction with them. But I’m not sure what laudable reason there might be for continuing to raise ancient history. Is there some (reasonably achievable) goal? Trying to get everyone to a different, more honest relationship or something? If that IS the goal, is this the best way to achieve it?
No, I don’t believe parents “sign up” to be a ongoing punching bag over any and all perceived child-rearing slights or omissions. Do you believe parents should continually bring up instances in which their kids were little pains in the ass years ago?
The OP describes some pretty extreme parental actions. Even so - how do you deal with such a past? Maybe there IS no effective way. If that is the case, I could imagine holding a grudge and limiting my interaction with such a parent - or I would try to find some way to get past it.
I suspect there is at least some element of ill-motive behind the kids laughing about such things in their parents’ earshot. Is this a contest to show that the kids are as flawed as the parents were? If you care so little about each other as adults that you don’t care if you are creating unpleasantness, more power to ya. I sure wouldn’t be associating with you.