Last season, while Mahomes and the Chiefs (and their fans) were crying about the refs correctly calling back the game winning TD for false start, Kelce was giving Josh his props for a hell of a game. Even though it was Kelce's crazy impromptu lateral TD that was called back.
He's a dude that respects the game. For comparison, Mahomes complained to Josh about the refs, basically telling Josh, "you just won because of the refs."