That's not to say that I can't care about rude behavior or do anything about it if it starts to persist. I've confronted more than one person who kept on with bad behaviors, at the coffee shop that I go to.

Usually a politely-worded request is all that's required. I may escalate to a second politely-worded request. I think that's only been needed once in 13 years of going to the coffee shop. The baristas handle it if it gets more out of hand.

There is behavior that I particularly don't have a problem with but other people do. This usually concerns the shared resource of space at the bar. One guy really needs his space, about half of a bar intended to seat 3. The coffee shop is his workplace and he needs everything just so. Other people roll their eyes and just give in, in many cases moving before he gets there. This, of course, suits him just fine. He seems to calibrate to just enough disagreeableness to get his way in this particular instance.

I'm just glad I don't have to get involved and can laugh from a distance.