My real name has a dimunitive. I do not use it. I never have. In fact, I started using my initials in grad school so no one would automatically turn me into a Potty instead of Potnia.
I remember when I was a new asst. prof, and went to see the "executive associate dean". I walked in to meet him, and he said "Hello, Potty, I am glad to meet you". Not missing a beat, I said "hello Davey, nice to meet you". This attitude was not nearly as charming then as it might be perceived now.
So when I saw the Washington Redskins on TV, all I can think of now (besides the fact that I need to turn the channel as quickly as possible) is "wrong name, dude". (I recognize this is now out of season. It was written A While Ago. I am not A Sports Person).