It's a poor form of humour, I've seen it when people who do not speak a language are exposed to subtle and sneaky comments. It may seem in good fun but it seems more like taking advantage of somebody. Unfortunately I think BJS will do a Broner and this build up will end up on one of those youtube boxing "when trash talk goes wrong" compilations.
Didn't like the antics with homeless person an drug addict and they have been other times when he has crossed the line. That said, I still think BJS is by far the wittiest, funniest, trash talker in boxing.