The difference is that a bar is a physical place, you cannot isolate yourself from the Nazi on the next stool and shut your ears against his tirades.
In the digital space, filters work just fine. Your messages will live in the same database as the Nazi's, but you can be completely isolated from seeing them if you set up your filters accordingly.
This would work of nazi did not went out of their way to harass target groups. However, they do it constantly until those leave. And then they spread lied about those who left or attempt to move it into IRL.
These groups really like to spread lies about people and events. They love to manipulate third parties or institutions into attacking you too.
Active harassment should probably be a bannable offense, few people will dispute that. What they will dispute is the mechanism used for banning; AI is notoriously bad at discerning human intentions.
In the digital space, filters work just fine. Your messages will live in the same database as the Nazi's, but you can be completely isolated from seeing them if you set up your filters accordingly.