These guys aren't robots, and we can't expect them all to respond to good plays the way we THINK they should. It just doesn't work that way. Maybe it's poor sportsmanship, but I even question that, and wonder how much I really care about it anyhow.
If a guy feels a surge of energy coarse through him after a one-handed follow-up dunk, he'll just naturally express that energy with fist pumps or a frenzied jump. Micromanaging to the point where we're saying "if JP can just stop acting excited after he gets in position for the airball, rebounds it back up, makes the bucket, and draws the foul...then I think he'll improve," is probably being too nitpicky.