Wear it like you stole it?Yes, I'm sure Susie lets you wear a 'If you can read this, the biotch fell off' t-shirt!
Actually, a good t-shirt for female riders would say something like
"The biotch just passed you...and if you weren't so fat, bald, and ugly, you might have a chance of riding with me...."
How about....
"I know you can read this shirt cuz I see your lips moving!
Stop looking at my arse and watch the road!"