Very disrespectful to your opponent, I would say.

How can you celebrate a victory if you’re gloating in his face and not providing him the courtesy of silence during the match?

I know it’s high school and these are just kids who don’t know any better but if it were me I’d ask for this game to be nullified and demand a rematch.

Oh, I hate this.

That was beautiful. Remembered my highschool chess club, we called it the 8x9.