I don't think you can generalize to the degree you are implying here.
There are significant differences between how we (as in humans) act outside the family and inside the family. Somebody may be toxic, have substance abuse issues, or display sociopathic traits outwardly but be a kind, loving and caring person towards their children. This discrepancy would of course create conflict, but parents not being perfect is also perfectly normal and happens in middle class families too.
I personally know a couple of people from fairly rich families. And while some of them definitely had toxic parents, some did not. Most of them are just people. In a lot of cases its just a case of ignorance. How they react to being confronted with their ignorance is IMHO more relevant for character judgement and that is also a trait instilled by their parents.
For what it's worth, the absolutely worst parents I know are thoroughly middle class.
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