Well, actually if you think about it, the sultan roosters have the backyard as their territory and another male(even if human) is entering it and may go after their hens. I'm not saying it's right, but it does make it more understandable.
Skipper is hormonal, I will agree that he's pretty sure he's top dog (or bird). And all I can figure out about that is that I'm short and my husband is tall. So putting your head above the bird is asserting dominance, and any time hubby is near Skipper, that is how Skipper see's it. While I'm more on equal footing with Skipper.
Turns out that PJ, the indian ringneck parakeet, just loves everyones feet. He fed my daughters toes the other day much to her disgust. I could hear her screaming at him from outside. "PJ that's disgusting, OMG you are so gross!" etc. I thought maybe he left her a gift from the other end, but it was just some nasty vomit feeding. Showing some birdie love haha!