Why does alcohol make some people turn nasty?

Why does alcohol seem to make some people become mean and nasty? I know two people like this in my real life who almost become totally different when they drink. One gave up alcohol altogether and the other still does it, and I know when he does because he's no longer mellow.

I've heard that the reason is because alcohol makes you feel less inhibited, even with your mouth. What do you guys think?

Why does alcohol make some people turn nasty?
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