I suspect Jaylen is just reacting to not being named to that young stars squad, which looks political, from the mish mash of rookies and non rookies. He deserved it, but he doesn't get enough minutes from Stevens, as the story goes.
I'm glad he turned it down. I think dunking is league marketing BS anyways. Plus Dee Brown wrecked his career blowing a knee dunking in one of these all star shows.