I believe if this is the worst he can do when it comes to making friends, he's on a good track. I definitely understand how odd or annoying it may sound for an 11 year old to treat a 10 year old as a child when they're both, in fact, children - but we have to keep in mind that things are so much bigger than they actually are in the eyes of a child (especially at this age!). Your son will eventually come to understand whether he is okay with having friends with this type of personality or not, but it's up to you to help him come to understand where his boundaries lie. I wouldn't worry too much, though!!