I don't think girls should ever chew gum in public. It just looks bad. And for some people, sounds bad too.
In class, the girl next to me was chewing gum. She went through 4 pieces, as in spitting a piece out and replacing it. Oh my lord. It drove me up the wall.
Mints are much more polite. They are discrete and can easily be tucked in your mouth. No one will even know that you're freshening your breath :) Plus, they are much, much, much quieter.
I am very picky about what mints I eat. There are two things that make me gag: sushi and strong peppermint flavors. Weird, I know. I'm obsessed with Starlight mints, Icebreakers, and the soft "baseball" mints.
Is anyone else bothered by gum chewing???
PS One of my friend's mothers related chewing gum loudly to a cow chewing cud. Haha.