Here is an album full of common reposts on this sub. If you see a post you think should be added, please comment with links. We mods are only human, and may miss some. This is why I'm making a new thread as well; the original was archived.
Also, before anyone claims this is meta-gatekeeping, A) enforcing rules isn't gatekeeping, and B) other subreddits do something similar, including /r/niceguys, which is where I got the idea.
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Gatekeeping is when someone takes it upon themselves to decide who does or does not have access or rights to a community or identity. /r/gatekeeping is a subreddit for screenshots and stories of gatekeepers in the wild.