I'm not sure what you mean by "dysfunctional autism" exactly, but this is a known trait of many autistic people. They often fail to pick up on social cues that most other people take for granted. It's just because their brain works differently, they tend to take people at face value. And unlike what some have professed to believe here, their desire to explain or correct you does not come from a desire to "be the smartest person in the room", but rather it's their way of helping. They like to have accurate information, so they assume others do too. So yes, combine these two traits with a person who like to screw with them and you get conversations like this, which unfortunately amounts to a pretty nasty form of teasing.