I have indeed punched nazis.
I was involved in martial arts for nearly two decades, I attended many tournaments in that time. I don't make any claims of being an amazing fighter but I was able to hold my own and I can really take a hit.
There is a huge spectrum of tournaments out there. Some of these venues were far less strict than others, and basically let in anyone who was good at faking being from an actual karate school, because some hosts just cared about collecting entry fees. This was a long ass time ago, I have no idea if it's still like this now.
So there were almost inevitably a scattering of delusional psychopaths who just wanted to fight, from gang-members to college kids who watched Bruce Lee films so many times they thought they knew how to fight. And of course a few tattoo-plastered biker types who were able to set aside their ego enough to actually put on a gi and follow tournament etiquette. (Love those black belts that are so stiff you can tell they've never been worn before that day.)
So it's easy enough to see things like hate symbols tattooed on some people's chests or arms. I am proud to say that I have gone against some of these chucklefucks and hit them hard enough that they fell down and had a hard time getting back up. One just left after the first hard kick to the nuts. Fortunately (and unfortunately) the same kinds of tournaments that let just anyone in also seemed really lax about enforcing "light contact" rules and people were routinely just smashing each other as hard as possible, and why I eventually stopped doing tournaments.
It's the same phenomenon of de-socialization that was radically accelerated during peak Covid that has led to everything from a 1000% increase in unruly passengers on airlines, to a drastic decrease in relationships and dating, to a whole host of people just checking out from the social contract and embracing ludicrous conspiracy theories and retreating to online safe-spaces where any crazy thought will be validated and praised.
As a species we were not meant to have constant exposure to millions of people's innermost thoughts and feelings and unrestrained impulsive ideas. It fucks with your head. Combine that with the economic incentive of keeping people in one spot, scrolling their attention-span to sawdust, and you are training an entire generation of people to turn off their inner monologues and to stop thinking entirely, just seeking validation and things to click on.
I feel strongly that AI ruining the internet will be a net-positive, as it's going to drive more people to human spaces to connect with each other. Sure there will be a whole segment of people raised in the AI slop of the next decade, but there will also be a subset of people who want more and create their own spaces with other real humans.