What, in your opinion, is an aggressive roo?

I have a 6 month old cockrell. Hand raised him and he was so sweet, but now he's getting spicy. I threw him some dried worms, turned around and he attacked the back of my legs (didn't hurt me) then ran off. He's also running up and threatening the dogs and cats (they ignore him) if I try to pet him up go the hackles. I'm not going to cull or rehome him, and I've read this is just part of "rooberty"

What do y'all consider an aggressive roo? At what age will i know if he's bad or just being a roo? I need to be aware of what to look out for, these are my first chickens