Oh come on. It was a pithy, funny joke that directly ties into one of the primary topics of this site and something most devs relate to.
I think this is only a problem if the humor isn't funny enough. I don't know if I hit the mark here, but if I make unfunny jokes I hope I get called out on it (or at least see it reflected in the vote totals), and that'll definitely regulate my posting. If we somehow manage to make enough good jokes to drown out on-topic discussion, I'm going to be very impressed more than concerned I think.