I know what he is, but that DOES NOT mean he (or Hawesy, or whoever) can just go chucking out derogatory phrases towards the mentally handicapped when he's on the radio. WHY is this such a difficult point for everyone to comprehend? Would you be saying the same thing if he'd 'accidentally' used...
It's not that people are offended, it's that (quite rightly IMO) they don't feel it's an appropriate thing to be said live on a BBC (or indeed any other) radio station.