Some people's breath is so bad that their face should be wearing diapers.
What's the source of your concern?
I'm sick of smelling their breath.
Yeah, that can be a problem with some people. However, for some, they can't help it. And blaming or insulting them for something they can't control is really bad form.
You don't need to be a jerk. I just have zero tolerance for bad breath.
I'm sorry if I came across as a jerk, but don't you think those people might already feel insecure about their problem? Don't you want others to be considerate of issues that you might have?