I mostly share the sentiment that this is just humor, so what's the harm.
That said, I did at one point have to exercise my diplomatic skills when I got
forwarded a customer (nameless here for evermore) question about whether
support for RFC 3514 was on our roadmap.
While the people on this list generally "get" the joke, not all readers of RFCs
are part of this group. The recent RFC 6919 is full of in-jokes (or perhaps,
in-roast?) that many outside the IETF will not get. Anyways, it is an issue,
but I think these are too much fun to do away with them.
Yoav