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I would draw the line at two factors - whether it is a public or private space, and whether exclusion is based on action or identity. If you don't want certain kinds of people entering your home, nobody can stop you from being a bigot on your own lawn. But in a public space like a shop or street everyone should be able to exist. Only if they cause serious trouble (actions) you can throw people out - that's why businesses have house rules. The real world is often more nuanced than this but it's a good rule of thumb, I think.