Man, if I was at an SS an an associate talked down at me, I don't know what I would do. I might call him out because it seems to be widespread enough that it could be part of their training ("negging" customers). I might roll my eyes and start with "listen, honey..."and be all condescending right back at him. I might politely disagree with him and tell him why he is wrong.
It depends on my mood, his demeanor, and what I am wearing.
Excellent summary, Mr.Six