I think it is the Chinese Cantonese she was using, the tone, and the demeanor which I did not describe that annoyed me. I guess you have to be Chinese to find it a bit offensive. She didn't sound like she liked it at all, in fact it almost sounded accusatory like "oh how old is that bag" --- not asking nicely - so I think she thought it was an old bag because she's not familar with Chanel, and she asked price then added "oh wow, that much for that bag!" sorry I left out those details.
I normally don't get offended by people asking me, but she rubbed me the wrong way. Guess you needed to be there.
OK, well that helps! I really thought she was just curious about the bag...it's hard to convey the whole story sometimes. Attitude makes a huge difference..I can now understand your reaction and feelings.