I believe you. I believe you b/c I was looking at some bling at an antique show and expressed interest in seeing a particular bracelet and the vendor said ,"Oh, that's David Webb! You can't afford that." I never forgot that.
The flip side to the dismissiveness of this comment is that (and this is a cynical interpretation) he could (consciously or not) try to manipulate me so that I'd say to myself, "I''ll show him! I'll buy the darn thing!" I can imagine sales have been made that way.
I do agree that you should report the SA. She had no business making any sort of judgment. Very tacky.