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I must be going to the wrong bars.Very likely. There are bars where people go to be alone; bars were people go in a group to stay purely within their group; bars where people go to meet between regulars and are closed to newcomers; bars where people are opened to anyone, regulars or 5-minute newcomer; etc.
The most classy, and also often the most hyped ones are the coldest ones. The most popular are often the warmest... providing that you manage to get into the 'family' circle if it is a matter of regulars/locals; or that you belong to the same scene if it is a subculture oriented place.
And it also depends also on you. And not necessarily as you expect. I am amongst the most introverted, shy, less talkative persons ever, and yet bartenders and regulars generally great me by calling my name on my 2nd or 3rd visit in a bar while some mates who've been coming to the same place dozens of times in are given the cold shoulder (I have plenty of examples like this, it was quite funny sometimes to see how upset by the situation my mate was :-).