Lizard Dude:
The only people who use the double-space rule are generally total elitist grammar dweebs.
and
Technically, you can use exclamations like "ooh" so long as they are their own seperate clause (meaning I did use it wrong in that context), and the word "leet" would not fall under Grammar Nazi-ism because, even though it's a slang term, it's an adjective, plain and simple. A full-on Linguistics Nazi, however, would follow that list to a T.