As part of healthy human relations, it’s necessary to know just how much of a physical distance you should keep between yourself and someone you don’t know on an intimate level. If the distance is too great, there’s the risk that you’ll appear uneasy. Likewise, if you draw in so close that the other party can literally feel your breath on their face, you can forget about making any positive impressions.
Apparently, some McDonald’s customers in China are creating a reputation for themselves by exhibiting “overly familiar behavior” towards the staff. This problem became a hot topic online recently when someone snapped a customer completely ignoring the rules of distance etiquette.