Personal Taste ≠ Bigotry
It is ridiculous to think that anyone has to like or prefer something. That's like saying there is something wrong for not liking the taste of licorice. If she thinks two girls kissing is gross, that's fine, she is allowed to feel how she feels. If she thinks that two girls kissing is wrong on some moral or ethical level she is being a bigot.
There is a huge difference there, and it is extremely important in today's world to understand this difference.
I'm not deaf, but just in case you don't get an answer that stems from personal experience:
Your hearing loss in the one ear is (I'm assuming) caused by the ear canal being blocked. Your sensory organ still hears you chewing because the sound is transferred through the bones of your skull to your ear.
A deaf person has a different problem: their sensory organ is damaged or missing, so it doesn't matter where the sound comes from, they don't hear it.