Speaking here in the US, if you don't have a local coffee shop your neighborhood is probably not very vibrant, and lots of business happens in these local coffee shops. I host meetings at my local coffee shop all the time and see others doing the same thing. Even if all you have is Starbucks, there's still tons of meetings that happen at Starbucks and you're not likely to be hassled to leave.
I'm much more likely to be pushed out the door at my local brewery or bar than I am at a coffee shop. If I had to guess it's because coffee tends to be a grab-and-go whereas beer cannot be served in a to-go cup so it has to be served and consumed inside the building with few alternatives if the seats are all full.
I think that New York City may be particularly bad in this regard. I remember when I lived in Saratoga Springs (a small city upstate), I could strike up conversations with strangers on the bus or train, and did all the time. Here in NYC, that's nearly unthinkable—only crazy people do it.
I'm much more likely to be pushed out the door at my local brewery or bar than I am at a coffee shop. If I had to guess it's because coffee tends to be a grab-and-go whereas beer cannot be served in a to-go cup so it has to be served and consumed inside the building with few alternatives if the seats are all full.