Sentences begin with capital letters. The words are I, you, your and you're. Not i, u, ur and ur. There is a dog. Their dog is there. They're happy to play with their dog. It's probably, not prolly. What, not wat. Beautiful, not bootyfull, unless she really has a huge ass.
We're all sick of people writing like morons and then crying and whining about it when they are told how dumb it makes them look.
We aren't smarter than you, but we at least don't make ourselves look stupid in our messages and bulletins.
Perfection not required, just make the effort to do your best.