Is there such a thing as a job that makes everyone love you?
Customer Support (they will get a call from "that guy")
Bank clerk (when the loan is denied)
Shop owner (because he didn't bend over backwards to accomodate your insane demands)
Bus/tram/taxi/lorry/any car driver (who told him it was fine to use your road?)
We love to hate
On a more serious (???) note:
Lawyer
Politician (let's face it, enter politics and no matter what, someone will hate you and it is my firm belief that no politician should be allowed anywhere near someone's property without being under constant observation)