The slogan has been around for a while: Punch a nazi. It has a sorta quaint, winking phrasing, so you'd be forgiven for thinking that maybe it wasn't actually meant as a real threat. But I think that theory has gone out the window. Just look at what happened to Charlie Kirk.
Lost terrain means lost leverage. Which means the usual threats have stopped working because they relied on that institutional and broad social leverage to be effective. And these loonies know that.
The threat of violence, however, is evergreen. It's the final resort of a movement that has lost a political and philosophical path to victory in the public square. It's sad, it's pathetic, but you're not wrong to be worried when political assassinations are justified and exalted in reference to the "nazi" threat.
But that's just all the more reason you can't give in, you can't give up. The defeat of wokeism in the workplace should give you comfort. These people are not invincible. The wheels have been falling off their political project for years now. You can and should say "no" when they come with the "nazi" nonsense too.