Just a wee bit irked

A friend of mine posted about a bad experience in a computer store and of course many of her friends chimed in with support. One comment sat wrong with me though, it was "I was looking for something and although I was wearing an IBM shirt they treated me like I was some hip hop gangster." It just reeks of respectability politics. So had he been wearing hip hop clothes would it have been ok for them to give him bad service? Does he believe that those black people who don't present in a button down professional manner deserve to be treated badly? I realize it's as much of a class issue as a race one but either way it irritates me.