That actually was a typo. Amazingly, a typo that has earned me a -3 downvote so far...
People seem really freakishly touchy about word choice around here lately. Honestly, that's likely to make me care less about their delicate sensibilities.
It's likely because the joke didn't add much. Word choice seems to be less important than humour with no other content, from what I've seen over the past few years.