When you can't find the right words to describe a sniveling, conniving, conceited, sneaky, overbearing, irritant goodie-two-shoes little fuck, you can sum it up by calling them a mincey little prick.
Person 1: Hey you, you Mincey Little Prick!
Person 2: What? What have I done to earn such a title?
Person 1: You have (insert offence here) which has annoyed me, you Mincey Fuck.