While talking to a bunch of teens, he has zero issues flashing the White Power sign while talking about AOC. He is not even hiding it at this point. Sure, he did not really hide it before but he did at least make an attempt to walk it back sort of.
I would guess I've seen him doing this a hundred times before. I don't believe he is deliberately doing this to show 'white power' and I think he has shown his actual racism plenty more times than when he's doing this thing.