In full expectance of additional stupidity in reply from you, one huge difference is that there isn't a national debate about whether or not it was OK to punch someone for being black.
Meanwhile they're are quite a few people "debating" whether it's OK to punch someone for being associated with the alt right even though they have not performed any punchable actions.
As with any debate, there are many people that can't actually debate the topic and skip straight to acting out for their side. With this idea being talked about more publicly, and alarmingly quite a few people landing on 'it's OK to punch someone for what they think or believe even though they haven't actually done anything' I won't be surprised to see more open acts of violence against those with supposed different beliefs.