“Quartz: So, is it OK to punch a Nazi?
Žižek: No! If there is violence needed, I’m more for Gandhian, passive violence……………
—while Gandhi really wanted to bring down the British state. But his violence was symbolic: peaceful demonstrations, general strikes and so on.
If a guy talks like that jerk [Richard Spencer], you should just ignore him. If he hits you, turn around. Don’t even acknowledge him as a person. That’s the type of violence I would call for. Not physical violence. Because, you know, people say symbolic violence can be even worse, but don’t underestimate physical violence. Something happens when you move to physical violence. I’m not saying we should greet everyone, embrace them. Be brutal at a different level. When you encounter a guy like the one who was punched, act in such a way that even hitting him, even slapping him is too much of a recognition. You should treat him or her or whoever as a nonperson, literally.
In other words, leftists should “go high?””
“It’s much more complex than that. I think that’s their biggest mistake. Isn’t is sad that the best left-liberal critique of Trump is political comedy? People like Jon Stewart, John Oliver and so on. It’s nice to make fun of him, but you laugh at him and he wins. My God! There is something terribly wrong with playing this game of ironically making fun of Trump. You know, in medicine they call it symptomatic healing when you take some things, they just neutralize the effects, like you have this pain, but they don’t heal the disease itself. Criticizing Trump is just symptomatic healing. Trump is an effect of the failure of the liberal-left. Everybody knows this knows this now. The only way to really beat Trump is to radically rethink what does the left mean today. Otherwise, he will be getting ordinary people’s votes.”
How my heart sings 
Perhaps you should have quoted Žižek’s initial response: “No! If there is violence needed, I’m more for Gandhian, passive violence.”
My own view is that we should think of the person first and the Nazi second. If the person is presenting an immediate physical threat to another person, then a physical response may be needed. Otherwise, we should look to the law to set limits on how people should express themselves.
Thank you for that illuminating comment, Mike.I shall add the first part as you recommend.And yes, we must do our best to recognise others we dislike are still human beings otherwise we become like them.You can;t force virtue on anyone.