I have no problem believing you know what you're talking about and I'm sure you're very impressive, but it doesn't make you unequivocally correct in this case, nor are you the ultimate authority.
It is your opinion that it wasn't unsportsmanlike conduct, but it could be reasonably argued that any instance of throwing the ball off the ground is unsportsmanlike on its face, abusing equipment etc.
Look, I think a good referee would've just told him to calm\tone it down & moved on. And that's what should've happened here. But to act like the ref had absolutely no basis or authority to call a T isn't true.