Why does this guy avoid me when he's drunk?

So basically, there's this guy that always avoids me when he's drunk. We have a lot of mutual good friends, and while I don't know him very well, I would say we're sort of friends. During the day if I see him he's always very friendly and nice. But the couple times I've seen him drunk I feel like he avoids me. I haven't been drunk those times that he has been, by the way. But why does he only avoid me when he's drunk?
Why does this guy avoid me when he's drunk?
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