If grammar Nazi's paid as much attention to their spouse as they do to eveyones grammar their spouse wouldn't have an entire other life that the Nazi wasn't aware of....for six long years. Just saying. If you're going to be a know it all its possible that you might want to pick something a little more important to be a know it all about!! But, whatever.
If you are (you're) a teacher and you do not know the proper way to use your and you're, I'd like to know where you went to college so that I can mentally thump your professors over the head. Repeatedly. With a hammer.