It sounds less like OCD and more like you're anal. There are hundreds of languages in the world with many dialects in each one. The fact that humans can communicate at all is nearly a miracle. Even two people speaking the same language can misinterpret eachother badly. All in all for Fuck's Sake, Chill the fuck out. There I said it. Someone had to. I'm use. Improper grammar, and theres nothin you can do about it. People who are anal about spelling and grammar to the point where they have to correct strangers show themselves to be obviously lacking something in their life.
My suggestion is the next time you feel the need to correct someone, do so. Then ask them what they think is wrong with YOU. I'm sure they'll tell you all kinds of bad things about what you look like, smell like, act like, what have you. See if you like it? I bet that would cure you VERY quickly. Seriously, try it.
