I mean, I'm not the grammar police, and I believe it was Drizz (come back!) who threatened to send someone after me when I said that grammar didn't matter, really, on a format such as this.
I would argue though that words do matter. Saying that words are just semantics -- semantics, at least in linguistics, are the meanings of words. So words are just the meanings of words? That doesn't make sense.
Here, we are all assuming that everyone is intelligent and although they might say something a certain way that's because they choose to say it that way for one reason or another, and not necessarily because they think that way. I certainly hope that RatsRGods' cousin doesn't think like that, because that is scary. But language, on another level, affects thought. For example, other cultures have different ways of counting and that's reflected in their language. It has been argued that Western languages allow for more individualistic thought and Eastern languages allow for more community-based thought (although I think this is a stretch). I think it's a feedback system -- thought affects language (we come up with Google and add that to the dictionary) and then language effects thought (we start expanding the word Google to become a verb that means search).
It annoys me sometimes when my grammar is corrected, if it is simply the case that I was rushing or didn't care in a place like this. But if it was honestly that my grammar was incorrect -- well, then, yeah, I'd like to know, because in a small way it's affecting my thinking.