I'm a feminist, or at least a believer in sexual freedom and equality who uses the label "feminist" because that takes less syllables and means the same goddamn thing dammit. And I think I have a sense of humor. I enjoy comedy and sometimes write it, and if I haven't got the knack of creating laugh-till-you-fall-over material entirely consistently, I know it when I see it. For example, the following clip, while being completely idiotic, consistently makes me laugh until I'm leaking bodily fluids: NWS dialogue and also terminally nerdy.
But there's two kinds of jokes out there:
1) Jokes which hinge on absurdity. "Ha ha, that could never happen!" A horse walks into a bar...
2) Jokes which hinge on recognizability. "Ha ha, that always happens!" What's the deal with airline peanuts...
The first kind is pretty reliably inoffensive, at least to me. There are no crypto-patriarchal implications to robot boners. It's also why I'm generally okay with dead baby humor and "The Aristocrats"--the content may be offensive, but the real joke is that nobody wants to kill babies and nobody would put on a show like that, so it's ridiculous to even consider.
The second kind, well, it depends what you're positing as the "always happens." If your joke is only funny in a universe where women are shallow/stupid/sexless/etc., and you think your joke is funny... then yes, you actually are accountable for believing that. The fact that it had a setup and a punchline doesn't mean it exists in some parallel Joke Universe where nobody is responsible for anything they say about anything.
The same joke can be either kind, depending on the person telling them. This can cause some hurt feelings when I understand that my friend isn't really sexist and thinks it's absurd to say that about women, but someone else doesn't know him and thinks he really means it. This is the reason that we have the "it's only okay to tell that joke if you're in the group it's mocking" rule, too.
Funny thing, though; people who tell offensive jokes don't usually use the "I was saying it's absurd to think that!" defense when they're called out on it. Instead they're usually quite willing to say "c'mon, you know it's true." And the next thing, of course: "don't you have a sense of humor?"
I have a great sense of humor! That's why I have a pretty good sense of when something's funny, and when it's not.
I feel bad that this post, ironically, wasn't funny. Here, have some genuinely funny jokes about rape! (NWS dialogue, but definitely not the "rape jokes" you're thinking of.)