I hope your question is motivated by concern for his wellbeing. I do not think that any of his classmates have any right to try to put a label on him. Labels can be very hurtful for the person they are applied to, and can sometimes become a self-fulfilling prophecy. If you care about the welfare and happiness of this guy, you should respect his differences, tolerate his inconsistencies and find room in your heart to stand up to those who would "throw his water bottle". Perhaps he was crying, not because his water bottle might get damaged, but because of the nasty intention of the person who threw it. That would make me cry, too, and I daresay you might be upset yourself. So leave him alone. Give him his space, be courteous to him, and try to understand that he needs affection and respect, just like anyone else.