[Letum]

Originally Posted by The Avon Lady

I found this despicable.

Wiped the smile right off my face.

To laugh at it because of the intended joke is despicable and immoral.

Not to laugh at it is to acknowledge the wrong in it. This is a knee-jerk reaction.

But there is another, more complex, joke in the irony that someone making a joke; can make the joke so despicable.
It's the humor of the unintentionally despicable, twisted joke turning into the despairingly post-ironic when viewed by those with higher morals, such as our selves.

To laugh at this in that way is to acknowledge the wrong and ridicule it.