Yes its important to give them respect. Every living thing deserves to be respected, even plants. Forcing just can't be beneficial to the bond. Just doesn't seem right. We should know that we have come a long way from that. The more your bird associates positives with you the more inclined it would be to return the favor and be at its best behavior. I suppose that forms the basis of positive reinforcement as well.My profile picture is of my OWA Kirby in pre-bite/bluff mode. His eyes were pinning, but he also was majorly poofed up and standing pretty upright. When he doesn’t want to be pet he actively sits up straighter and puffs out his feathers - if you ignore that he’ll slick them back real fast and HONK while leaning away from your hand. If you don’t listen to the honk…well, by that point he’s told you three different times to stop, and you’re in for at least a bruise.
In this case I think someone he didn’t like had come in the room, lol. I can still usually handle him when he is like this, but I make a point not to press him when he’s uncomfortable unless it is necessary. It’s just respectful, and I have found if I respect his space when he tells me to back off and it’s not an emergency, then he gives me more leeway to handle him when he’s upset when it IS urgent.