Apparently at least some fans in Orlando have some residual anger toward Dwight Howard.
Howard spent the first eight seasons of his career in Orlando before leaving in 2012, under ugly circumstances, for Los Angeles (then leaving Los Angeles under ugly circumstances for Houston, and so on). The Magic have been rebuilding ever since.
Wednesday night, when Howard checked back into the game for Atlanta in Orlando, he heard the boos (as you can see above) and he laughed and encouraged them. Then everyone moved on.
The up-and-down Hawks went on to win the game, their fourth straight victory.