I would never advocate for kicking someone in the face while picking up their paddle, but I can confirm that games get heated sometimes like any sport. Particularly on the close calls.
apparently the video is from a tournament that took place in Mexico.
The guy that did the kicking had just lost a match. And the guy he kicked had accidentally knocked the kicker's paddle out of the kicker's hand. So he (the guy that got kicked) bent down to pick up his opponent's paddle, and was rewarded with getting kicked.