What makes anyone think this is a nice joke?
What I see is a sarcastic remark insinuating that in fact Aspies
are broken and useless and yet we naively insist that we're only different and misunderstood, when we really need to be changed or discarded...

Maybe I'm just paranoid after years of abuse, but I think it's overly simplistic to accept it as 'nice', when it may in fact be snide ridicule aimed at a group without the social skills to recognize it as the insult that it is. Like patting someone on the back and saying "Hey, great job", when you only did it so you could tape a KICK ME sign to their back...
Only in the same way that applies to ALL lightbulb jokes. How many X does it take to change a lightbulb? The answer will be something stereotypical of an X in a way that finds a fault such that the answer isn't simply 1.