Because it was written by a team of producers who tried to make music to a new generation firing against their parents music. The irony was that everyone hated that song when it came out.
And it somehow still got to #8 on the UK charts, according to Wikipedia: http://en.wikipedia.org/wiki/The_Reynolds_Girls
It's weird though. The song is kind of enjoyable for like 5 seconds, and then I get sick of it extremely fast.
It was in backlash to all the movie producers that rode around in open top cars at the time with underage girls by their sides and weren't being prosecuted for being fairly open about the fact that they were fucking kids.