I haven't quite worked out if I'm more embarrassed by the stupidity or the fact that some seem to not just defend it, not just makes excuses for it, but find it in any why shape or form, endearing or entertaining.
As others have pointed out, this isn't laughing at the mentally impaired or those who who actually have learning difficulties, more rallying against the continued promotion and endorsement of people who appear to have no enthusiasm or motivation to try not to come across as a total dumb ass.
When a supposedly mentally able, 30 year old man cannot tell the difference between the sun and the moon, and some people actually try and defend his ignorance, you know the path to enlightenment is going to be a long and tricky one.