Those I know in the deaf culture hardly see themselves as disabled, weaker, or disadvantaged in any way, thus using their difference as a point of humor, "It was so loud that...", isn't really knocking them. It's not so tragic that even deaf people are unable to laugh at themselves. We're all just people, here. I see Williams' doing a comedic impression of a deaf person complaining about the noise as akin to his putting on various language accents---which hopefully no one sees as offensive. He's being silly. That's what comedians do.