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In the grocery store the other day, I saw a man clipping his fingernails while standing in the aisle, deliberating over products. Are you really so pressed for time that you must take care of personal hygiene chores in public places? And does cutting your nails take so much time that you have to multitask it?
Furthermore, perhaps it's just me, but cutting fingernails seems like a private, sort of intimate, kind of gross activity that you really should not be doing (a) where other people can come in contact with your clippings and especially (b) where other people's food can come in contact with your clippings. Take it to your own bathroom, please, sir.