So, I posted this ~4 days ago, it's gone somwhat viral here (225 retoots, 485 likes as of now), and today was the first time I had to block anybody over it — and both accounts were explicitly Nazi supporters. Both of the instances they were coming from were (a) running Pleroma and (b) had posted rules that allowed what the accounts had posted ...so both of those servers are now de-federated from this one.
Fascists can continue to fuck off into the sea forever more.