TBH, I never go into Starbucks and I'm not familiar with their policy. I just assumed I'd have to buy something if I went in though, like most places - I was kind of confused through that whole video how it was a racial issue, but certainly if they normally let you just hang around in the place well, fair play, it begs the question why the guys were asked to leave.
It's still quite amusing to see the CEO being very fake contrite, I wonder what his view is when he shuts his front door and talks to his wife....