Lavin was letting his team know that he was fighting until in the end and setting tone the for the next game. What's the big deal about getting thrown out when you're defending your team?
That the wrong message could be received and you could have a player hurt a guy by intentionally fouling him and that kid could get ejected and or suspended. Also, I don't remember seeing a coach go after a ref like that in a long time. Where he was arguing is embarassing IMO.