To be fair I think Michael has a point.
If it wasn't offensive then he wouldn't be bothered by it and therefore this topic wouldn't be made.
Certain people react to it differently but not hearing what was said I can't really have an opinion.
BUT...
Because Chris Moyles has such distaste, was so nasty about Nicola Roberts and because 99% of the UK hate him then I'm sure it was probably unacceptable. Especially when he has such a high up role on radio y'know it's just not clever, he ain't a comedian and he ain't funny so he should just **** right off.