It's probably unreasonable of me to find it quite so irritating, but I can't stand it when people don't know/care who the PM is, who the ruling party is, what's generally going on in the news, or know really really basic geographical facts.
I watched a TV programme once where a reporter went around some members of the public showing pictures of well known figures (think Clegg, Cameron, Miliband) and the amount of them who didn't have a clue was worrying, even when they were told the name.