At absolute best, it's tasteless, and certainly grounds for social exclusion, but criminalizing and especially pathologizing mildly anti-social behavior is profoundly immoral, reckless, and inhumane.
Completely relinquishing the ability to judge things on their actual context in favor of the unthinking punitive application of absolutist principles is the beating heart of every anti-human ideology.
Putting Nazi shit on things you own is a sign of tribal identity and that tribe exists to break our norms and kill us once they have the chance. On one's own head be it. This may catch up some dipshits who want to offend people. But...y'know? That's OK. Don't be that dipshit. Don't play with Nazi shit.