Don't you have a lunch hour?   I live two minutes from work so I go home to eat and I drive home where I live.  BTW, I just got an exceeds expectations on my performance eval.  So I think I am fine there.  Posting this from lunch right now.
I would try to talk it out.   Resentment creates problems.  If it's bugging you, I am sure the guy isn't doing it on purpose, you have so something or you will burn out or explode.  
I have served in armed forces, been in combat.  Be little my comments all you want but I have a better claim to manhood than most here.  I fought so you " real men" could have freedom of speech and cheap oil. Oh yeah, Bush lied about that, my bad.
Today at 12:20:30 PM 
Yeah.  Plus, the idea of a guy who spends a good amount of time on CelticsBlog every day going to his boss and complaining about somebody else's assumed lack of productivity just seems to open a can of worms that shouldn't be opened
Don't you work?  Some would call this hypocripsy, hope you are not charging someone $70 bucks an hour for the time you spent posting this matter.