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I would say try to actually resolve the problem if you are in a position to do so (through education, or mod actions), and if you ever reach a point where your only option seems to be escalating the issue by posting a callout or saying "DNI if you interact with this person" maybe just stop instead, because at that point you cannot do anything to better the situation. And if you or your immediate friends aren't directly involved in any way, then you really can ignore it. It's not your problem and random people (or friends of friends) getting involved is likely to make it worse.
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