that's just discrimination based on disability. if he were blind and accidentally bumped into people, or deaf and failed to respond when people asked him questions, it would be easier to notice his condition; those are a lot better understood, and regular people don't expect people with such disabilities to overcome them and act "normal" by just making a personal effort to learn how to see or hear, like they do of conditions they can't notice, understand, nor respect. what saddens me the most is that some people claim to be for tolerance, diversity, inclusion, and safety, but they will go out of their way to make society intolerant and unsafe for people with this sort of disability, excluding us without as much as trying to understand what makes us different, special, and valuable in various ways