Tie. Mainly because I have a big boy job, and I'm an adult.
Apparently wearing ties make one a condescending asshole! I suppose if I worked as a waiter at a 'fancy' restaurant I'd be arrogant too.
Just because the two symptoms often appear together doesn't necessarily mean one is causative. I'd say its more likely that the rear-opening you mention is more likely to get the 'big boy job', due to privileges (the same ones that made him a backside-apperture-type).
Thus, the disagreeable personality, the 'big boy job', and the tie are all symptoms of our oppressive capitalist society, dead0man, none causative, but all telling.