... Oh, my aching sides! 
I agree with you. Also think it's rather juvenile.
No doubt there are others who would tell us to "lighten up, it's only a joke", or the ubiquitous "get a sense of humour".
That last one always puzzles me because what the person is actually saying is, you-should-laugh-at-the-things-that-amuse-ME!
... and then there's that old chestnut accusation that we are "prudes" or, as I've read a couple of times on GN, "pearl-clutching" prudes!
Just as an aside - does anyone still wear pearl necklaces? I think I wore them once when I was about 17 at my first ever company Christmas dinner. I didn't dare clutch them though because they belonged to my mother who lent them to me for the occasion. Together with my twin-set (yes, really!) I must've looked 17 going on 70
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