I, for one, don't care one bit where you pee. If the cart's in the aisle, what else are you supposed to do? I'm not going to sit in F and judge you for using the lav up front. Everyone's gotta go.
Domestic F is about having a bigger seat, dedicated overhead space and being able to get off the plane quickly. The food's bad, I don't care if they put linens on the plastic trays after they microwave my TV dinner and I certainly don't piss a circle around the front lav.