Brit here. I've been watching the events unfolding over the last week with increasing incredulity. I have to say the reaction to this t-shirt is taking things to another level.
My only theory is that this is the puritanical aspect of the US we always hear about. In the UK double-entendre's are so ingrained into our society that I can't imagine someone being offended by this.
I get the same impression, someone gets uptight about a bit of juvenile sexual humour, and complains. All seems a bit Victorian and silly to me, but then I'm not from the US and I've not got any major hang ups about the human body. Male or female.
My only theory is that this is the puritanical aspect of the US we always hear about. In the UK double-entendre's are so ingrained into our society that I can't imagine someone being offended by this.