What is correct: "You've got to be kidding me" or "You are too kind"?

Question

There is a question in my test that makes me confused. Here is the dialogue and I need to fill in the blank: > A: You are a great dancer! > > B: _____. I dance terribly. That is what I remember (not word by word). I was reluctant between two choices: > You've got to be kidding me. and > You are too kind. I knew the former can be used so I chose it. However, after thinking thoroughly I thought the correct choice might be the latter so my final decision was to choose the latter. My reasoning: the former (even though is correct) seems rude. The latter seems much nicer. When I received the test back. The answer is: > You've got to be kidding me. In short, I would be grateful if anyone can point out the differences between the two phrases and show some example if possible too. Thank you!

Answer 1

"You've got to be kidding me!" indicates sharp disagreement with the compliment. If the response had been, "____. I sometimes think I've still got so much to learn," the better answer would be, "You are too kind."