She asked you for clarification, and you refused. Right there, you demonstrated that you wouldn't show the most basic courtesy to others. Whether or not the other person was disabled is totally irrelevant.
Nobody owes you any information about themselves. She did, however, engage in a polite manner. Because she recognized that you were attempting to interact with her, she asked what you wanted. She may well have heard or seen something without being able to understand your words. If she's a lip reader, she may have needed to be closer to you to understand you.
For goodness' sake - I'm not deaf, but I can't understand speech well when there's any background noise, unless I'm focusing on, close to, and looking at the person speaking. I probably would have had to ask you to repeat yourself, too!
In any case, you were asinine, and you really need to improve your manners and your compassion.
To the person who claims the woman wasn't deaf - you're simply showing an immense amount of ignorance.
As I understand it, there is an entire Deaf subculture. I'll leave it to a Deaf person, if one is present, to speak for them.