No, giving Nazi salutes and wearing armbands is Nazi cosplay. It doesn't make you an actual Nazi. Sid Vicious wasn't a Nazi. Biker gangs aren't Nazis. The Nazi ideology is about suppressing your individuality and pledging everything to the state. That's why they had morning to night regimented groups. They controlled the schools, after school programs, hobby organizations, even vacations. It was all state run. It's this type of regimentation that makes it really extreme and virulent, as opposed to just white nationalism as espoused by people like Churchill and FDR. So please be careful when slapping the label Nazi on everything in order to justify your own discrimination against groups you don't like.

People wear transgressive symbols and put on transgressive displays in order to piss others off and show their own independence. But wearing a Che Hat doesn't make you a communist, neither does sporting a hammer and sickle arm band. Neither does singing the International. Please don't confuse performative displays with the real thing: kids dressing up as historical cowboys and indians are not actually cowboys and indians. Stop pretending.

Lastly, we don't live in a society of self-help for this stuff. You are obligated to rent to anyone who can fulfill the terms of the lease, and if you don't like that, then get out of the rental business. Let the police be the ones charged with preventing mass extermination. Petty discriminations don't help protect anyone.