Would you talk about how to be friends with a Rebel? You said you have a few. It seems to me like everything you might do to be a good friend to them is going to make them feel like you're placing an outer expectation on them, and they're going to resist it.
Rebels want to act from choice and freedom; they can do the things they WANT to do. They may not want to join a book group where they'd be expected to read a particular book and commit to meeting once a month, say. But they'd love to get together to talk about a book they liked.