Surely that should be "toffee nosed prevert..."?

What gets me riled is when I am engaged in an argument, and someone chips in, ostensibly on the same side, but saying things guaranteed to undermine the case I am trying to present. Like a stab in the back. And it's almost as annoying when the same thing happens to someone on the other side. Either way the chances are the whole thing will turn into a brawl.