Although many grammar fuckups annoy me, I think the more important thing to do, if you honestly consider yourself to be a mature and intelligent person, is to look the other way if it's something that in no way makes it any significant amount more difficult to understand. For example, if some re-re rapes their own texting style with num83r5 4nd le773r5 just to try in futility to be cool but ends up making it way inconvenient to read and comprehend, then I totally understand giving them shit. But for simple, albeit blatantly obvious and easy to avoid, fuckups like "would of", "your/you're", etc., which do nothing to make it harder to understand, I don't see any worthwhile reason to be bothered.