I've actually never found gender based humor funny, at all. And no, I'm not supressing my laughter out of some kind of moral determination, I honestly have no inclination to even smile in the first place. A complete lack of it in society wouldn't be a loss for me at least.
Anyway, I really don't like how often these generalizations get thrown around. They are the rule rather than the exception. You can tell me your intent is to jest, but intent does not determine consequence... You know how if you repeat a rumor, you give it strength, no matter what you think or say about it? This is sort of the same.
And the effect does seem apparent. You can call these generalizations insignificant or innocent, but I can't help but notice how someone like myself is basically mute and invisible in a discussion about men and women. You seem to believe it more than you claim.
As for studies about the differences between male and female behavior, I concluded some time ago that the only really enlightening study would be a trend study. We have to examine the opinions of men and women on a variety of subjects and keep tabs on it over a period of decades, and see how much it changes, and which parts change. That would actually be helpful.