The condition is analogous to normal inbreeding which causes a severe lack of genetic input.
-"Oh yeah, he doesn't have a sense of humor and he's afraid of his own penis."
-"Guys, don't make fun of John...he's socially inbred because his hyper-religious mom homeschooled him."
-"Some Mormon kids down the street from me were all messed up from social inbreeding. They were like children of the corn, only creepier."
-"I saw him kiss his mom on the mouth."