Snort back to you! I agree with Dreamchaser that the hearing people are one step away from deafness. It is far easier for a hearing person to became deaf than a deaf person to become hearing. Haven't you ever heard of this quote "A picture is worth 10,000 words"? All you have to do is to look at the signing and the expression of the signer.... that is far more 'bandwidth' than spoken words! Haven't you read Harlan Lane's "The Mask of Benevolence" - especially the part about the doll house (page 122 - 125)?
It is proved there that ASL is superior to oral language when it comes to spatial description. (one volunteer tells the other volunteer the layout of the doll house and where the furniture are supposed to be according to the picture on the box. The deaf volunteers did much better layout than the hearing volunteers!) Here is the quote "Sign languages exploit the unique features of the visual medium. Oral language is linear. Only one sound can be made or received at a time. Sign language, on the other hand, is visual; hence a whole scene can be taken in at once. Information can be loaded into several channels and expressed simultaneously." from
Sign language - Wikipedia, the free encyclopedia under 'Spatial grammar and simultaneity'. It is clear that ASL is much faster and better 'bandwidth' than oral language.
My own family doesn't know sign language. They have me to practice ASL with but they still don't know sign language. I am sure that there are many many hearing people who have a deaf relative and they themselves don't bother with ASL.
If they think they have the right to look down on the Deaf people, then I suppose we do have the right to look down on them for not be able to sign. I don't make fun of those who do know ASL (more power to those kind of people!). Remember the Golden Rule.