I don't know anything about this guy, so I'm not defending him.
That said, I also had no idea the OK signal was taken over by white supremacists. I knew it could be used to make people look and then you get to punch them in the arm, which is how we used the OK signal all the time in High School. For all we know, he could have been playing a prank on his buddies that he got them all to look at his hand and gets to punch them all. Or maybe he's a racist piece of trash.