Wow, he refuses to sign an autograph? And that makes him a jerk?
How dare professional athletes live their own lives. They should cater to the fans at every whim.
If you referenced Clemens' outward arrogance, or the games he starts every season with new contracts, or his relations with the media, etc. It may hold more weight. But to reference one personal anecdote? About how he wouldn't sign an autograph for free? Not a very strong argument, but hey, that appears to be your MO.