do NOT let him get away with it!! the next treat time,, be even slower, keep watch of him out of the corner of your eye, and when he tries it again, CHASE him down, either pick him up by his neck, or by the legs, whichever way, walk with him a second, then hold him,, if he even SLIGHTLY tries to get away, grab his head, and sit him on the ground,, and SIT on him,, till he stops trying to get away,, then take him to the coop and THROW him in it ( not hard enough to really hurt him, just hard enough to "grab his attention") then close the coop and walk away and feed the others the treat. the WORST thing to do to him is NOT BE MEAN!!!!!!!!
when he did that to you,, he was saying HE was top dog, and you told him he was right by not kicking the ca-ca out of him. i know i sound mean, and awful,, but i say these things so that your next thread wont be " i had to cull my mean roo today" .. they ONLY understand roo talk,, and if you dont talk to them in their language,, then they dont understand what their doing is wrong.
on anotha note,,,, dont give your son a choice! just like the roo, talk 12 year old boy way,,lol,,, MAKE him go out there and sit with you once or twice a day, make him just sit there, ya dont even have to talk, just sit,, and YA he will hate it,,,,,at first,, and you'll want to start that "parent talk" with him,,,,DONT. just sit there for 15 minutes and stare at the birds. animals teach us humans alot of things, by setting examples,, i bet after a week of making hin go out, he starts wanting to,,,,,, and give him a bird, make it HIS bird, his responsibility, even if he ends up killing the poor thing,, he WILL learn from it, and he will learn alot from it,,, even a death of an animal YOU was responsible for, is FULL of lessons.