I would let this little boy know why your rules as so important. If a child runs ahead of me when we are walking I DO yell because it's dangerous. Rules are important. If it helps, I started out calling my rules 'Daycare Cool Rules' then made a little rhyme:
'No kicking, no hitting, no throwing toys,
Yes hugging, yes sharing, good girls & boys.'
So whenever they do something wrong I could remind them to use the Cool Rules. But outside I'm crazy strict with my rules.

My son has ADHD & he was a sensitive boy and now he's a sensitive man, but I don't think they go hand in hand. My children were raised to respect other people and be kind and have good manners. I think you just need to give this boy an extra hug and explain that he has to listen to what you say because it's important to be safe and eventually he will realize that you rule all, hahahaha.

I also had a girl who came in and asked for food, but I just told her that she would have the food I prepare when it is ready......so go play!