It has nothing to do with race. Go into any restaurant or coffee shop, sit down and don't order you will be told to leave. Say you are waiting for someone and you will be asked what you want while you are waiting. It is a business. If you are not on the premises for a business purpose, you are a tresspasser. The two men were rightfully arrested.
I think you're right.
I'm certain there is more to the story because the police would not have arrested them for nothing more than just sitting there while waiting for someone. I know there are situations in which racially-hostile White cops will unnecessarily arrest, abuse, or harass Blacks but I am sure such incidents do not occur as often as some Blacks would have us believe -- even though they themselves have themselves bullshitted well enough to believe their own bullshit.
There is the world the way it is and the world the way some Blacks think it is. Such Blacks spend most of the day bullshitting themselves and the rest of the day bullshitting each other, and when confronted by reality they reach right into their carefully structured bullshit repertoire, which is why so many of them end up handcuffed, fucked up, and locked up.
So anyone who believes the cops just walked into that Starbucks and arrested those two urbane gentlemen for absolutely nothing is a ******* idiot who is just as stupid as the handcuffed nitwits who now have something else to bullshit and feel sorry for themselves about.