Why do people generally say you won't meet someone decent at a bar or club?

I suppose you have the kind that go all the time, regardless if they have a significant other or not, but i'm a decent guy, what if I go? lol There are shitty people all over and I think you just have to learn how to spot them ahead of time before things get too far along

Why do people generally say you won't meet someone decent at a bar or club?
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