Film about rich kids beating normal

I’m trying to find a movie I watched about 10 years ago. It involves a group of rich kids initially mistreating an average person. However, the plot takes a turn, and in the middle of the movie, one of the rich kids ends up being confronted or beaten by the normal one. I recall scenes around a swimming pool and themes involving teenagers, parties, and drugs. Can anyone help me identify this movie?

Hi, could it be “Alpha Dog,” (2006) by Nick Cassavetes?

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