There's no evidence this was a race-fueled attack, the race-baiting is annoying when anyone does it and we should stop with that nonsense already. Given Antifa's track record for punching political opponents, it would have been more racist if the white dude didn't punch the dude because he was black. This could be a hilarious step towards equality. Now if a black Bernie supporter would get sucker-punched by a white dude and it wasn't made about race, we'll have arrived.
And obviously the sucker-puncher should go to jail and anyone who sympathizes with him is a douche bag.