[Sorry, Luffy straight up laughs when John crashes into the wall, the way one might laugh at a pratfall in a sitcom. It's not mean-spirited at all, either, he genuinely thinks this is hilarious. John gets clapped on the shoulder cheerfully.]

You're funny. What's a christ?

[But regardless of whether he gets an answer to this question, he's already barreling onward, as is his wont.]

Anyway, you don't have to worry about enemies. If anyone's trying to hurt you I'll beat them up!

[This is, transparently, not a joke. He is smacking his fist against his other palm as he speaks.]