Thin privilege (and male privilege, in this case) is being bad at sports but being able to play them for fun without worrying that the only thing you’re accomplishing is reinforcing a stereotype.

Thin privilege is not having to worry about whether you would look best playing and having fun, sitting down on the side and watching your friends play, or leaving altogether. Thin privilege is not worrying that if you decided to have fun and try to play that it would only reinforce a stereotype and make things worse for everyone of your size.