This is an interesting thought. I've actually never thought about this before.
Dudley was constantly pampered, got everything he ever wanted, and grew up to be utterly horrid. His upbringing could have taught him to be generous or selfish. He just happened to go the selfish direction. He saw his parents bullying Harry and found it okay to do the same because he didn't get in trouble for it anyway. This is the same idea with Draco. The only difference is that his parents practically encouraged cold behavior towards others.
As for the Weasleys, they had many children, but all of them were loved. They didn't get everything they wanted, in fact it was hard to get anything they wanted. They could have taught their children to be miserable and ungrateful, but they often did things together as a family. And that taught the Weasleys to be caring and kind. Similarly, although not much is said about the Grangers, we can assume Hermione's relationship with her parents is close to what the Weasleys had as she never really complained about them.
Harry's upbringing wasn't at all like Dudley's/Draco's or the Weasley's/Hermione's upbringing. He was very mistreated by the Dursleys, and yet he didn't turn out miserable or horrible. He could have picked up traits from the Dursleys and treated his classmates the way Draco treated them. Or he could have become miserable and had no friends at all. But instead, he chose to not follow the Dursleys' example. This could be because he was really born a good kid at heart, less likely but possible. Or it could have been because of Lily's sacrifice.
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