Who cares ?
Those whose minds are capable of picking up on nuances and making connections to seemingly unrelated matters. A technique that has long been a mainstay of something called "humour".
I've provided a link for you to the Wikipedia article on humour. You might find it educational.
Only the terminally stupid would not have understood.
Well, you didn't. How many times did you ask for clarification? ...
See above - the terminally stupid are unlikely to make such connections. Although, I suppose ARRSE is probably full of counterexamples.