WOW, everything depends on how you do it. If you do it in a way that is condescending then yes he might feel that way, if you do it in a way that makes him feel like an adult then he won’t. For instance. You said he is set on going away to this school. So the right thing to do is teach him how to manage on his on while he is there.
“if you are sure you want to go away to this school you will have to learn some survival skills and how to take care of yourself because they do not provide maid service. So when you gather your laundry I will meet you in the laundry room and show you how to do it yourself.”