Doesn't understand why do you like him. Socially akward and quiet. Inflexibility of thought. Problems forming friendships. Mistaking social cues or body language. Not eye contact. Very quiet, people often thinks he is mute. Finds the noise overwhelming. Low self-esteem. Difficulty or reluctance to express or label his own emotions. Levels of anxiety which seem excessive compared to the situation triggering him. Hyperfixation on things like marine animals.