[Percy had to listen to his mirror go on and on about everything. That's enough punishment, he thinks. What words are worse than the ones that come out of something that has the same face as you?

No.

He thinks Percy has learned his lesson. When Percy speaks, he listens closely. The same kind of issue as Val had. But instead of somebody draining away the color it was the mirror.] You aren't missing all your color, at least.

Just because you don't think it's wrong doesn't mean you should've been forced to listen to it. Or have other people overhear your problems.