Good. They asked a leading question, and he turns away now, bored and a bit careless, looking at his hand. Play it lightly, Mettaton, he thinks, you don't want to be too different from your other half.

"Sensation, yes. I'm a celebrity back home. They worship me, because I deserve to be worshiped. I was made to entertain, and entertain I do."

Unlike you he implies. You didn't do what you were supposed to do, and that's why they hate you, isn't it?