>it didn't offend me

Fry's post says that one of the problems is due to people being offended on behalf of other people they have never met.

So they are not offended personally (e.g like most people), but they imagine that it would be offensive to someone else (e.g. a minority) and decide to co-opt this imagined offence.

It's a curious difference in being offended personally, and defending others via imagining the offence of that other. One can see another point of view, but its harder to imagine another changing their point of view.