This kind of thing happens on the court all the time. Omri was out of position and Donte was trying to get him out of his way. If your posting up a smaller man the last thing you want, is one of your teammates moving close enough to you that his defender can help out on you. As it turned out the player defending Omri is the one that blocked Donte's shot. So Donte had a legitimate reason to be upset. Its called spacing the floor.
I would like to add that I wonder if the situation was reversed, and it was Omri yelling at Donte, if the euro fans would be so quick to judge.
As a "Euro" fan (again, contrary to popular belief, not all "euro" fans or even all Israeli fans are the same or have the same opinions about everything. It would really be nice if some people here started treating us as individual fans rather than an inseparable group) I think that team members should not be yelling at each other, period. It just hurts your teammates' confidence when you yell at them, and it's the coach's job to point out players mistakes, not the players' job. So yes, if Omri yelled at Donte I would definitely view it as negative behavior.
That being said, this sort of thing happens, and as long as it's not one player consistently yelling at his teammates, I don't think anyone should be making a big deal out of it. Omri and Donte are good friends, and I'm sure they won't be making a big deal about this either.