"The notion that one is superior based on one's ability to hear or behave in the manner of one who hears." (Tom Humphries 1977)
The English term "audism" is coined by Tom Humphries, 1977. It's becoming more common.
Semantic variation. This ASL sign was seen in a short video "Crack the Audism" produced as a student in 2003.
Related signs: Audism Unveiled.