Not going to give parents a pass for lacking class and integrity. If it was only the student section then that is understandable, but parents and adults should be held to a higher standard. If you get your rocks off going after a 15 yr old, because your side isn't getting the job done, then that adjective truly fits.
That being said, the PNG coaching staff and any admin at the game should be embarrassed of how those adults acted, but the BH coaching staff should be called out for not protecting their player.