dont get different scissors get some that have the same size holes as handles then its not "different"
the growling is SOOOO normal in our house!
DS usual responce to people is " im 4" haha thats it doesnt matter what they say its just "im 4"

i think that the teacher has said something shouldnt mean its a bad thing.. not everyone is resiliant! just work with your DS and give him some tools to use when he is hurt by others...