Before we get all 'The Sky is Falling' with Alt-Right knuckleheads migrating to specific instances that cater to them, remember:
1. The block feature actually works here and should be used liberally if you see bad faith arguers or worse.
2. Instance-level personal blocks can be executed on the web client by going to the user, opening the additional […] menu and clicking 'Hide all from this instance'.
3. Petition your local moderating team to ban and suspend instances outright. We'll listen!