I agree and I was at school in the 80's too. I don't know the details of what's being alleged, but the only pass I'd give him is that language does change. If he's directed personal abuse at someone to make them feel uncomfortable that's always totally wrong, but I'd be lying if I said we didn't refer to the local shop as the P shop (as they even did on OFaH) or make jokes about jews, Ethiopians or Cambodians. We even called people Joey after the poor guy on Blue Peter. I might be the only one admitting that on this platform, but I know I won't be the only one who did it.
In today's terms that was all totally unacceptable and in fairness was unacceptable back then too, but everyone I know from school said the same and whilst I'd never consider at the time what we said was racist, I wasn't on the receiving end of it to judge.