I'd like to see the full view of this photo, as it appears to be cropped. To me, it looks like Spoelstra is upset with an official's call and Howard (his assistant coach at the time) is trying to deescalate the situation. As one can see, both coaches are looking in the same direction
Having made that observation, that does not mean I approve of either coach's actions in the handshake line (especially Howard smacking the assistant). Howard definitely deserved the suspension and fine (the league possibly could have added another 10 grand), but Gard deserved and received punishment as well.