Do you have a basic understanding of sentence structure and syntax? Do you know the difference between their, there, and they're? Do you grimace when you read things like; "omg like this movie sux why are their so many cus words i wish it had ponys cuz there so cute or unicorns maybe lol!"?
Then according to the internet, you are a Grammar Nazi!
Now there's a way to let others know that you have at least an elementary level mastery of the English language. The Grammar Nazi shirt.