What's Wrong with Being a Grammar Nazi?

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Sometimes, especially when a language is not your native tongue or if you have difficulty with it for some other reason, it is understandable to get things wrong. Some people also feel that grammar and spelling don't matter in certain situations, particularly informal settings and/or on social media. Whether it does or doesn't matter is debatable. What does matter is whether you can be understood. It also matters whether poor grammar in social situations seeps through into more formal situations. I'm sure it can be annoying to have someone point out your every spelling mistake or grammatical error. It is, however, quite annoying (and, some might say, nonsensical) to demean someone for doing it, assuming it's not done maliciously. So, to my question. A similar question can be applied to many things. What exactly is wrong with wanting to do something right? Personally, I take pride in knowing that I write well, that I am not reliant on a spellchecker, and that my work can be understood by a wide audience. Similarly, a sports person, a carpenter or anyone else who's good at something should not feel wrong for being proud of their abilities. Nor should they be ashamed for wanting to share their knowledge with other people. Admittedly, unsolicited advice (on any subject) can be quite frustrating but that doesn't mean that we should dismiss that advice just because 'society' doesn't see them as important.