Oh no. no no no no no. I don't agree with any of this. Its essentially promoting SS behavior. Someone says no, well, if i ask enough times, or make a big enough (albeit polite) pest of myself, I will magically get what I want.
I hate this. Working in retail, i've had customers ask me sometning, I say I'm sorry, no, I can't do that, I don't have that item in the size you want, etc. I then watch them go and ask another CW, and another, and another. Who all give the same response. We did have one manager who would not know the backstory, and say, well, let's see waht we can do, giving the customer hope, only to discover that I was indeed correct, and we can't accomodate their request. Thankfully, she then had to deal with them!
I think its rude and entitled. Rules and policies are in place for a reason, and I really hate it when someone comes along, and tries to get them bent, for their own benefit.