Why are ghetto blacks and hispanics so rude?

There are plenty of borderline ghetto people at my job and school. They're usually real nice and friendly when things go well. But when any sort of conflict arises, they're literally the most disrespectful, rude people I've ever met. Yelling, screaming, bullying, incivility is normal in their culture. They over blow small issues into big issues. I literally saw a Caribbean man yell at a 13 yr old kid for accidently bumping his huge schoolbag into him. A Samaritan on the train told him to calm down and that its completely unnecessary for him to yell. He didn't like the fact that someone told him this so he began cursing out this good Samaritan. At school, I know of a classmate who wasn't very good at her internship. A ghetto hispanic woman was constantly being condescending towards her and ignoring her at certain points. Has anyone else experienced something like this from these people too? I know bullying exists in every culture on earth but its just that ghetto hispanics and blacks tend to do it so much more...

Why are ghetto blacks and hispanics so rude?
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