The whole tight shorts/ball pocket thing
I know most people don't feel the same way, but
1. The thought of those tennis balls touching somebody's nasty sweaty skin against their leg disgusts me.
2. I can't stand reaching up my skirt/shorts to grab a ball or put the ball in, it takes longer. I can't stand waiting for the other girl on the court to reach up her skirt/shorts to grab the ball or put the ball in.
I know...I'm mental....