Low self-esteem is no excuse for stupid irrational behavior. Why Hollywood and society doesn't seem to get that is hard for me to understand. I guess it doesn't sell tickets or get you on a Jerry Springer show. Jamie, let's write a script about your mall excursions. While I agree that the portrayal of the character with a disability is not balanced and fair, it is not incumbent on a film or fantasy to be fair or avoid stereotypes.
Filmmakers are only responsible for telling a good story.
The fact is there are bad people in the world. Some of them are men, some are women, some are white, some are people of color and some are people with disabilities. The movie does not attempt to be a documentary. It is a fantasy. It is a comic book.