Why do people like to yawn with their mouth open in public? isnt this bad manners?

i was brought up to believe it was extremely bad manners to say the least when one yawned or coughed in public with their mouths open. i find that these days with careless abandon, everyone seems to just do it. open theie mouth irrespective of where they are and the odours they emit, they just open their mouths and... show more i was brought up to believe it was extremely bad manners to say the least when one yawned or coughed in public with their mouths open. i find that these days with careless abandon, everyone seems to just do it. open theie mouth irrespective of where they are and the odours they emit, they just open their mouths and yawn. what happened to being socially respectful or social etiquette. this is appalling. terribly!
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