You have a group of people who want a filter bubble and a group of people who want a community.
Who do you exclude from a filter bubble? : Anybody you disagree with.
Who do you exclude from a community? : People who commit violence or abuse.
It is healthy for you to be exposed to ideas you disagree with. It keeps you from becoming a person who is never challenged and does real harm when they think they're doing the right thing.
The standard should basically be: "If this person said what they said in public, would be put them in jail?" that's what gets them banned and instances full of those people get those instances defederated.
If you don't want to hear opinions you disagree with then use the block button. Build you filter bubble how you'd like, but you don't get to control everyone else's view of opinions.