Depending upon the breed, they can be sweet, like cuddles, rooster included.

You can pick them up when it's dark. They like the chest rubbed, but not too hard, gently.

There is clockwork going on in those heads they don't have a lot of control over.

Put him in the right situation, and the rooster program turns on, and he's going to be an instant asshole. If he gets into fight, protect, or mate mode.

Girls are his trigger.

He's not going to care if it's mom and sister.