There's a number of things that Bruce could say Tony could stand to do - a great number of things, really - but he doesn't say any of it. It all gets shuffled down the queue and shelved away with all the rest that he tries to ignore.

"No, no, it's. That's something to get all... About. You don't have to apologize, and, I mean. Especially not to me. I'm kind of pretty much the poster guy for anger issues." He tries to smile an apology there, make it seem slightly less of a deal than it is, but. It only halfway works.