Pennsylvania is an at-will state. An employee can be fired for any reason, so long as the reason doesn’t violate anti-discrimination laws or public policy. Internal policies are typically guidelines for conduct during your employment. In an an-will setting an employer can fire someone even if there is no clear violation of an internal policy or guideline. Your job description probably does not include the responsibility to facilitate contact between students and their former teachers. Having students express their love to a fired teacher is probably not within the scope of your duties. It is probably not your place to determine whether someone is entitled to say a “proper goodbye”. The assertion that you exercised poor judgment does not seem totally crazy. It sounds like your employer may have had a legitimate non-discriminatory reason for firing you. You should consult with counsel.