As long as they don't make such horrendous grammatical errors in real life, i.e. papers, assignments, resumes, then who cares? Well, if you can understand them enough/easily, then who REALLY cares. If you don't like the fact that some people don't care about grammar when it comes to typing up a post or comment on a Minecraft(video game) based website, then you should probably just ask someone what they're trying to say(if their sentences are incomprehensible) or ignore it. I'll admit, it annoys me too, but I just have to deal with it. It's not like people are just going to start type like a grammar nazi just because someone doesn't like the way they write. That's just my two cents.
