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This shows up in a lot of other areas, like small game companies that have a devoted following. It can get pretty nasty because these types of people are able to be condescending just short of ToS, while baiting other people into crossing the line. A common thread is weak moderation or biased moderation.

As a developer, it's easy to be blind to this because they're on "your side", but it's bad for the health of your support forums.