I've been involved in managing a few social communities, including some face-to-face ones, and the one thing I have never figured out how to handle is the person who isn't exactly doing anything wrong, but people just find annoying to be around. Like, has a voice that is grating, or are just socially awkward. They can harm a group by driving people away, but there's no good way to say, "Please leave, people just don't like being around you."
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