“You’re” is the contraction of “you are”. “Your” is the second person possessive adjective. They are not interchangeable, just a tip.

Um…thanks for the input?

So, let’s go ahead and talk about a couple of things. First of all, I don’t particularly give a fuck about editing. It’s porn, not poetry, get over it. If you want to be my copy editor, drop me a line–I can’t pay you–

But wait! If you actually gave a shit about correcting my work, you’d be kind enough to tell me where I erred, instead of just telling me that I made a mistake, which is about as nice as me jacking your cock with a glove made of sandpaper and razor wire. So, I assume that you derive some sort of pleasure out of critiquing the minutiae of people’s writing. 

Maybe grow the fuck up? What matters in language is that people understand it, not that it’s free of imperfections. The same way that everyone understands that your a total douche.