The short answer is: because he is. :)

The longer response is that I have a long standing love/hate relationship with him (when I say "relationship" you realize it's totally one-sided, right?) and back in 2007 (or 2008...I think it was 2007, though) I started calling him "Crabcakes" (which is a word I often use for anyone being cranky when they really shouldn't be) because for a kid who has it all he never looked like he GOT that he has it all and always looks a bit "crabby".

To me, he always looks pissed. I don't find him Josh Beckett-like intimidating (which I know he wants to be) so the pissy look just doesn't work for me. Hence, he's crabby.

Although this year I'm probably ditching "Crabby/Crabcakes" and going with "The Bobcat Murderer".