A genetic abnormality doesn't have to be a disorder. Someone could have a genetic abnormality that protects them from the bubonic plague and not be considered "disordered".
Also, calling someone a moron for judging an autistic person is an oversimplification and generalization. That person could be quite intelligent, but not have the culture, compassion, or education to not judge others.
Science doesn't care about anything. Science is a system we've created to help progress our awareness of the universe. However, all scientific theories are based off of assumptions, those assumptions come from society's values, and those values come from the people with power. The point is that science still has aspects that are socially constructed, which means that it's not entirely definite. A measurement can be definite. What that measurement means is subjective.