That being said... it is normal for more pecking order behavior to take place.
And we have had some chicks act like jerks from very early age, and stay biters right into their last days on earth.
But they should have lots of friendly curiosity... offer up some treat if you like. Careful though, they WILL UN-intentionally try to take a finger off or chunk of your palm with them. My birds know I feed them so they always rush my hand by that stage. And some will like to peck freckles or other spots they see. They LOVE to peck open a wound. So don't let them see any, it's painful.

And oh yes they will invite their friends to feast on the fresh blood as well. I still consider it more instinct than actual aggression.. and the blood must taste goo to them.

This is why cannibalism can be an issue among chickens.
Before long they will be snooty teenagers avoiding you...
If you do have one that IS displaying aggressive behavior towards you... I will give them a gentle peck to the head or slight pull on the feathers at he nape/back of the neck the way another flock member would. and make them run away from me. Of course that wouldn't be trying to make them fear you... just respect you... It won't cause fear later in life. And isn't really something I will do with cockerels, that's a WHOLE other ball park! I don't want them to see me as part of their pecking order... just know that my rule goes. I am the giant that brings feed every day. No (actual) aggression will be tolerated from someone who is too stupid to recognize the giant who has brought food every single day of it's life.