Covering your mouth when yawning

by katherine
(GA)

Please explain what happened? Why is it so terribly difficult for folks to cover their mouth when they yawn?

Often in a conversation with someone they will open their mouth so wide without trying to stifle the yawn or in any way cover their mouth during the act. I am left to view their tonsils. (I discreetly look away)

But what is more weird is that even my mom (who raised me with manners) and my sister (who was raised as I was) no longer cover their mouths when yawning. It is worse when the person yawning has the sharp air intake and strange sucking sound while yawning without saying 'excuse me'.

Is it no longer good manners or proper etiquette to politely put your hand to your mouth when yawning?