Seariously; do you need to chew so loudly?!

OK, I understand the need to chew and there is nothing wrong with it, except when you sit next to me and just by the smacking of your lips I can tell your eating a wedge salad with extra bacon bits and you substituted the blue cheese dressing with the house vinaigrette (this is a exaggeration but I think you know where I am going). Today on the my T ride into work a man was sitting across from me enjoying what else but a Dunkin Donuts bagel with cream cheese and large coffee. He was chewing so loudly I was going out of my mind, he was chewing louder than my iPhone would go. Is it necessary to chew with your mouth open? Does it make your food taste better? If you know the answer please leave them in the comments I have to know why people do it. However, through this blog I would like to encourage chewing with your mouth closed, and dont eat anything around me unless there is a Polka band playing in the background.

(P.S. I'd like to thank my roommate for chewing his tangerine in a annoying fashion so I could have a picture)