My males are not the most friendly (the girls are super-sweet), but I can handle most of them, once I get them to stop running lol! I had one roo that despised my red feed scoop, but only the red one. He would try to flog it! But has never been aggressive toward any people.
Now, they will get on opposite sides of fences, and boy oh boy! Bloody combs thru the fence, etc. I have a young roo now, in a pen with his daddy and some girls, and he gets a little aggressive when the girls aren't feeling submissive. But its basic chicken stuff. In that same pen is a momma raising 6 little ones, and none of the other chicks have been aggressive toward the babies at all.