Is it just me, or do woos have no sense of humor? I know that some of it's probably biased sampling, since I mostly end up dealing with woos when they're being antagonistic. When they do attempt to make jokes, though, I never see the humor in it.
One possibility that comes to mind involves something my brother often said on the subject of humor: It's often based on logical fallacies. The punchline of many a joke ends with someone missing the point, or a reveal that only makes sense if you change your assumptions.
"A man walks into a bar. He says, 'Ouch!'"
This one deals with equivocation and a change in expectation from pattern recognition. First, in interpreting the word "bar", most people understand it to be an establishment that sells alcoholic drinks because many jokes begin with people walking into one as the start of an anecdote. This joke's humor is in the subversion of that expectation via equivocation that changes the definition of 'bar' to a rod.
All that for a very simple joke. The inability of many woos to identify logical fallacies seems like a likely candidate for their lack of humor. Combine this with one belief of mine: That humor requires at least a grain of truth, and the woos' inability to interpret what they see doesn't contribute.
I've seen some pretty bad examples of woo humor, including bad glurge. One particularly nasty example came from Dane Cook, who is not funny. He essentially told an anecdote about an atheist getting poetic about "coming back" as a tree after his body decays. He then goes on a vicious diatribe, fantasizing that the tree gets chopped down and made into the paper for bibles. His manner of saying this "joke" and the cheering fundies of the crowd left a feeling of savage bloodlust in the air.
Dude, not funny.