http://jezebel.com/women-dont-need-r...1573710092/all
If you are a waiter/waitress:
- do not comment on what people order
If you run a cash register:
- do not comment on what people buy.
Not even in a friendly way, let alone critical.
For what you are doing is not friendly, it is intrusive. The presumption must be that it is the customer's business what he is buying or ordering, and it is not your place to comment on it.
The white way, which is always the right way, is to
respect people's privacy. Serve them, if that is your job, without obtruding your personality -- even in a friendly way. That is the traditional and professional way to act. Let the person you are serving initiate the anti-hostilities, in which case you are free to respond, always with respect to the time value of the other people in line.