I think there should be a comma of some sort in between "true" and "I." It's "You're," and there should be a comma or a full stop in between "funny" and "stop." At least I think there should be.

But you know, you're grammar is so much better than mine so who am I to judge? Oh look I made a smiley face. I'm witty.

It's true, I do. You're not funny, so stop trying.