Everything you say may be true.  However, he still shouldn't have been texted his fellow administrator the things he texted.  Had he used an ounce of common sense and saved his nasty comments about former students for a verbal exchange, or texted his disparaging comments from the privacy of his own home, none of this would have happened.  While the behavior of the kids who were kicked out of the game is inappropriate, that in no way excuses the unrelated actions he chose to take.