He won't point out that Thor's not actually all that busy. Either Steve's being polite, or he doesn't get around the area much to have heard otherwise. Tony is a different beast he'll defer to Steve to. Probably doesn't want to hear about anything even remotely Avengers-y anymore, and who can blame him?

"Fair enough. If I run into Bruce, I'll probably just keep quiet about it. If he disappeared, it's for a reason."