that's nice
A common response to a comment which you find uninteresting, boring, or you are just downright not in the right mood to care about.
Example:
Person 1: Dude, I just did a quadruple backflip on my unicycle!
Person 2: That's nice.
Person 1: Hey man, I asked out this chick, and she rejected me.
Person 2: That's nice.
Person 1: Dude, I just did a quadruple backflip on my unicycle!
Person 2: That's nice.
Person 1: Hey man, I asked out this chick, and she rejected me.
Person 2: That's nice.