He just shit on your whole life, bitch.
I don’t get it
He’s thanking her for her criticism because that’s the polite thing to do when being judged for something you are pursuing a career in. She showed her complete and total lack of class and tact by misinterpreting his thanks as an acceptance of a compliment. It put her in her place in a very discreet yet sick as hell way. Basically, he revealed that she is trash in a very polite way.