The reaction to actor Rhys Ifans's joke at an anti-slavery benefit concert really irks me.Actor Rhys Ifans. Photograph: Dave Hogan/Getty ImagesRhys Ifans' joke at the anti-slavery benefit concert at London's Forum was this: "Why is paedophilia so popular? Because kids are so fucking sexy." At this point, in the normal run of things, probably if this was in print and not on a blog, I would have to say: "Of course, thi…