I don’t see it that way. I’ve watched the whole sequence several times now and it appears they were cheering when they realized he was really limping.The cheering started because the fans saw Ibaka steal the ball from Durant because he slipped, which most fans would do when their team makes a play. The rest of the applauding was what everyone does after an injured player gets up on their own. They were showing respect for Durant, not being rude.
I wasn’t in the building so it’s tough to know for sure, but that’s the vibe Ibaka, Lowry, Green etc were getting. Even Drake looked concerned.