is the way some of them talk to their kids
In my full-time job, I often appear at people's homes unexpectedly and have the opportunity to view their homes from top to bottom. That means I get to see a slice of life as it exists for those people, at that moment.
I also get to see the full-price spectrum - from the wealthy through to the poor.
And what I hate most about the poor is the way they talk to their kids. As a generalization, they have no qualms about using me, a total stranger to leverage their kid into some type of behaviour (such as getting them to clean their rooms, etc.). The difference between them and the rich, is that while the rich may aslo do this, they don't try to humilate the kid while doing it. Many poor parents have absolutely no idea "How to win friends and influence people". And they are equally clumsy at handling their children.
I consider it no surprise to find that poor people are often drawn into conflicting with authority figures - after all, they learned it at their parents knee. With so little backing from their parents, it's no wonder they've learned poor habits.
Now, before you flame me, not all rich parents are good, nor poor parents bad ... but as a generalization I have found this to be true.
JW