That's it, you gotta buy something in these types of stores. Places like those huge rest stops on the highways are probably ok to go in and just sit there without buying anything, but not a single store like Starbucks. It's not a mall lol.
That's what happened here. They could've just said "ok, we'll buy a coffee while we wait" and I bet the manager would've been fine with that, but they refused and that's what precipitated the situation.
And that guy telling the cops "what did they do what did they do" he knows exactly what happened lol. Worldstar!