A question

A guy tells a joke. A listener doesn't laugh. The jokester comments that since he didnt understand the humor that the listener is not very bright.

Is this a valid and logical conclusion ?

I ask this because this one of the themes coming from the comments following the piece on rape jokes here

http://www.cnn.com/2013/06/25/living/rape-jokes-women-comedy/index.html?hpt=hp_t3

When I first read the first part of the piece, I was rather enraged that anyone could get humor out of rape. Then reading further then reading some of the comments I have my question above.

Dave
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There are 10 kinds of people.
Those that understand binary and those that don't.