I'm asking about shutting up when she starts bitching but not coming across as a whiny sullen little bitch.

I used to keep gym clothes in my car at all times and when she was starting to get bitchy, I'd grab my shoes, hop in my car, and go lift. But that still has a hint of bitch-ness.

Now I look her in the eye, shake my head and smirk, then grab my shoes and say alright I need a run.

How do you guys balance the line between STFU and not looking like a silent grumpy bitch?