I think Murray was kind of a jerk for what he did, and Randle was stupid to over-react. But it wasn't much of a reaction, and hardly a major foul. There is an unwritten rule about not scoring in the last few seconds and respecting your opponent at the end of the game. Murray acted kind of like a middle school kid.
But honestly, if we change the name on uniform and say Murray did that to Kyrie, and then Smart came over to Murray we would all be giving kudos to Smart for sticking up for our team.