There was a question about Emacs, and the answer was a chunk of elisp that was wrong - one of the closing parens was in the wrong place, so it caused an error. OK, easy fix! But I don't have enough karma to edit answers on StackExchange and have them submit cleanly, so I submitted an 'edit suggestion' or whatever they're called.
Unfortunately edit suggestions can't be submitted unless they have at least five characters of difference - seems like a fair rule to prevent tiny changes but five characters of difference can be a world of difference in elisp.
So I pad out the edit suggestion with a comment that added some value, only to have the suggestion rejected by a user who freely admitted to having "no emacs experience" because he "didn't think it looked valuable".
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It also reminds me of a conversation I had with a professor of mathematics that taught one of my classes. He said he started and stopped editing Wikipedia the same day - when one of his changes to a graph theory article was reverted by someone who was "a computer repair technician" because of some Wiki-rule.
It's very possible that he did break the rule and his edit should've been undone, but at the same time he's the editor that Wikipedia desperately needs to attract.
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Sites like this have Harrison Bergeron's Handicapper General ensuring that all contributions are seen as "equal", so it's not at all surprising that the article identifies one of the more comprehensive Wikipedia articles as "List of Pokemon".
Wikipedia needs to figure out how to say that the guy who wrote a paper with Erdös gets more leeway on mathematical articles than a guy who repairs computers all day.