Depends on the bird, if they are in such a grumpy mood they don't want to interact with people then I would never force them to. It just kind of depends on the day I guess.
Or hungry. If Birdie is hungry, she will squawk like nobody's business...This may sound weird but Zazu has never yet had a grumpy day that I can recall. Maybe more nippy but that's when he's over-stimulated or something.