Always good news?

I walked into the office yesterday in a happy mood after a great class and told Bossman about it (New Girl was also there). The conversation continued like this:

MrT: ‘If you remember correctly, I didn’t want that class. Now I’m not giving it up.’
BM: ‘Good, because you can’t.’
MrT: ‘I don’t want to. I’m just giving you some good news. We could use some of that around here.’
BM: ‘What do you mean? All the news we have here is good.’
MrT: ‘Obviously you’re delusional.’
New Girl burst out laughing.