I don't know about you, but even if I didn't have a good sense of humor, I wouldn't go around admitting it. I'd rather admit to gluttony or tax fraud than to not having a good sense of humor (Note to IRS agents: I have never knowingly committed tax fraud).
There are some people, let's call them: automatons, whose minds are like a vast ocean of ill-perceived, incongruent waves (aka: mush, in the sense of being extremely loose and unstructured or as one might say, illogical). These are the people (dogmatists, idealogues, and others with one-track minds) who seem to lack the ability to step outside themselves and their systems in order to appreciate a joke.
Thanks for sharing this journey with me. I think jokes are funny to the extent that they enhance a positive idea or disparage a negative one. Jokes are funny when the good guy (positive idea) wins and the bad guy (negative idea) loses. When the bad guy wins (negativity) and the good guy (positivity) loses, it just isn't as funny.