Most employment is "at will". This means that a company can set the conditions of the workplace much as it sees fit. Accordingly, unless your demotion violated the terms of an employment contract or union agreement or was the result of actionable discrimination it was legal. Therefore, if you were demoted due to your race, then that would be illegal. Unfortunately, this is not the situation in your case. Therefore, while your superintendent's actions were unprofessional towards you, they were not illegal. However, if he indeed made racist comments and it can be proved, then the people against whom he made the comments could have a claim.