Helen, I've got great respect for you so please don't think I'm trying to argue etc (written stuff is always a bit more difficult to interprete, rather than speaking!)
I've not seen the video, but if it's the case that 2 black guys walked in, sat down straight away and were asked to leave within 2 mins for no reason, that's terrible...I just don't believe that's what happened. If it did, the female manager is obviously a raging racist, but I then wonder how she was able to manage the shop for the time before when she was in charge.
Reading between the lines, for clarity, what I'm saying is that assholes these days normally will look for ways in which they can get themselves on YouTube or whatever and, couple that with the silliness these days with "persecution" et, it's easy to set up a potential mark.