You should see the customer service / sales people over in Japan, they drop your stuff to the front of the store for you, plus they don't hand over the shopping over the counter/cashier. They first get out of the counter and hand it directly to you :) It's awesome.
But then again, maybe some of these workers really don't want to be working right as a sales person so they might not want to have the will to work and be happy etc.
Either way, it'll be nice if the customer service is nice if not then it's not my problem. Overall, i think it isn't fair that some customers are so rude to the sales person, they should understand the position their in first.