If I can read what you say, I don't mind. If I start to stumble over misspellings, unneeded abbreviations, and misplaces punctuation, then we would have an issue. (Take Cubelands, I have to decipher his damn posts)
I guarantee you will come to points where people post just to correct small grammar errors you may make.
I would advise that you try to not make spelling errors. If you make small ones, not many people are gonna attack you for it..