Boston is like its own country of assholes. You have the giant college population which are the drunk assholes. You have the rich "old money" assholes, mixed with the regal "better then you" assholes. You have the historical assholes, mixed with the micro brewery assholes. You have the smart "I go to MIT or Harvard assholes", mixed with the "I am a big time medical surgeon" asshole. All the Doctor, Lawyer, Researcher, Surgeon, Policemen, Professor, and Scientist assholes live in Boston.You have the sports crazed assholes , mixed with the I lay concrete in Southie and Dorchester assholes. You have the clam chowder and lobstermen assholes, mixed in with the revolutionary war assholes. You have the Whitey Bulger Irish Mafia assholes, mixed with the guido Italian mafia assholes.
Honestly, it's because of the congestion. People in places like Boston and New York deal with massive traffic all day long. You get so pissed off just trying to get home from work, that you get all fired up when some shithead from Oregon is going 3 mph looking at there GPS, or some skank from China is asking you to take a picture while she blocks all the foot traffic on the walking routes. Everyone is running all over the place working there balls off, and the weather sucks in the winter!