[keeler]

You're whitewashing it. Your example of a "rape analogy," which itself might be in poor taste (let's agree to be agnostic on that for the moment), isn't analogous to the rape joke that was said: "No doesn't necessarily mean no." The OP blog post implies that people were either dead silent out of shock at the rape joke, or they laughed at the rape joke -- meaning everyone understood it to be a rape joke.

You mentioned a "slavery analogy," which makes things interesting: I'm sure if you think hard enough you could come up with a slavery joke that, if uttered, would be obviously inappropriate.

Nothing you've said even gets off the ground until your counterexamples are analogous to the joke uttered.