I don't see a cut-off point between legitimate and illegitimate humour, anything that amuses some people must be legitimate humour in some way. You could certa

I don't see a cut-off point between legitimate and illegitimate humour, anything that amuses some people must be legitimate humour in some way. You could certainly see a lot of humour as potentially offensive to some people, or in some cases slanderous (which I think is worse than merely being offensive). You could also think that somebody who chooses to wear a shirt like this might be advertising themselves as bit of a dick. Inappropriate is also a sticky concept, it might be an inappropriate item for a kindergarten teacher to wear to work but it might not be so inappropriate to wear around adults who would understand it as humour.