If you're going to be one, be right. (also, Grammar Nazi is a title, so the G in grammar needs to be capitalised)
I googled your idea of 'correct' grammar in double quotes - and the results I got were all Indian job listings.
For 'of' vs 'over' - it's a matter of what I'm doing. For example - I have command over the forum rules, because I can edit them, you have command of the forum rules because you follow them. As for English, I don't make the dictionary/language therefore I don't have command
over it, but because I can use it, I have command
of it.
The Oxford dictionary example for '
command' is basically the same structure - "he had a brilliant command of English"
The
responses here do a better job than I could be bothered doing of explaining why it is "the English language" not just "English language".