not impressed your proud of your kid fighting.
I don't know how much high level hockey you have watched. Whether I or you like fighting in the game, it is part of the game. We as parents told him we do not approve of him being an aggressor in fighting, but if an event happens that requires it, we accept the necessity. If his teammate gets hit from behind into the boards, he can react in a number of ways and if that in Junior hockey becomes a fight, then so be it. We do not approve of the initiation of either the reasons to fight or initiation of the fighting itself.
Pride comes from a spot where he engaged because his goalie got sticked. He took on two players older than himself to defend his goalie. The other player said "Take off your cage.", which he did. The combat was fair and honourable. The two combatants got out of the box and tapped each other on the shins and chatted in the hallway afterwards as friends.
I respect your position on fighting and in many ways agree, but you may parent your children how you wish. Also, if you do not like fighting, I am not sure this particular section of HF was designed for you.