What does John think when he hears that Kit has been visiting Hannah in The Witch of Blackbird Pond?

John Holbrook believes that Kit should not hang out with Hannah Tupper because she is a Quaker and has a reputation as a witch. 

John Holbrook is a friend of Kit’s.  She met him on the ship on the way to Wethersfield.  He was coming to study with Dr. Reverend Bulkeley.  He often comes to the Wood house, where Kit loves to listen to him read aloud.  She knows that Judith is interested in him, and Mercy actually is too. 

When she makes friends with Hannah Tupper, the old woman who leaves in the meadow by Blackbird Pond, she knows most people will not approve.  They do not like her because she does not come to Meeting, and because she does not associate with them at all.  This is why they call her a witch. 

Kit does value John’s opinion, but she fears Dr. Bulkeley’s influence. 

Probably, she concluded now, it would do no good to ask John about Hannah Tupper. Whatever Dr. Bulkeley thought about Quakers, John would think so too. (Ch. 10) 

One day Kit is walking back from Hannah Tupper’s house, and she runs into John Holbrook.  He asks why she is walking alone, and she tells him that she has been with Hannah.  He asks if her family knows, and she says that Judith and Mercy knew, and that Hannah is a good friend of hers. 

When John objects that Hannah is a Quaker, she asks him if that matters. 

"Yes, I think it does," he said thoughtfully. "Not that I hold anything against the Quakers. But this woman has no proper reputation. She's been accused twice of practicing witchcraft."

"That's just cruel gossip."

"Probably, but I'd hate to see it turned against you too. (Ch. 13) 

Kit tells him that witchcraft is silly.  John starts to quote Dr. Bulkeley, but Kit doesn’t want to hear that.  She thinks that John relies too much on what Dr. Bulkeley thinks.