When you're arguing with someone on the internet and spell one word wrong, they use that as evidence that you yourself are wrong as well.
Person 1: Well actually, it is more likely that Bush did NOT do 9/11, although their are still a few people who like to mindlessly argue.
GrammarNazi: How am I supposed to believe anyone who spelled "there" wrong?
Some1 on Instagram who lacks in the grammar department. Grammar Mustards might think of themselves as grammar masters but spell master and mustard. For example, the first found Grammar Mustard was discovered by Sophia and Stella. :)
One to go beyond needed to criticize a person's writing or grammar. Could be one whom is very over reacter when someone uses grammar incorrectly or spells a simple word, or any word, incorrectly.