1. Picking at or sucking on teeth. It's disgusting. 2. Talking on the cell phone or texting while being checked out. 3. Letting your kids run wild while you are in public. This only makes you look like an idiot. 4. Treating customers with contempt because they don't meet your personal standards. Do your job and keep your personal shit to yourself. 5. Calling me and/or texting me when you have nothing to say.