Okay...I might be a little over-sensitive to it. Just ask DH. I generally send him the death glare if he's eating anything remotely crunchy: cereal, chips, carrots...oh God...*shiver*...carrots. Sometimes I'll turn the volume up on the TV. Sometimes I have to leave the room. Seriously.
It's like nails on a chalk board for me. For example, the worst part about going to the movies, besides the constant fussing with wrappers (ugh!!), is listening to people eat their popcorn like they haven't eating in 6 days and they have to shove as much of it as possible in their mouth that they are forced to chew with their disgusting mouths open.
So, commercial makers: take note! Please leave out the gross eating noises! We get the gist that the people are enjoying the food without having to hear each individual chew. Adding this grossness factor does not help sell your product.