Joking about social/religious/political topics in deep technical docs is something else entirely, unless I'm missing something about moo.
EDIT: If you're not a native speaker, I'll try to explain it better. First I quoted the statement that it was not about political correctness. This indicates that the next line is in direct response. Then I wrote "of course there is" Which is to say that of course the comment in the original post was about political correctness. Then I gave the example of apt-get moo as a joke that is very public, and not political at all, to point out that nobody wants to get rid of it.