Rudeness has no legal remedy.
Here are some legal theories for wrongful termination.
The Age Discrimination in Employment Act (ADEA) protects employees forty years of age or older against discriminatory firing based on age.
The Americans with Disabilities Act (ADA) protects the qualified employee from wrongful workplace termination. An employee that has a physical or medical impairment is protected under the ADA.
Title VII of the Civil Rights Act prohibits discrimination and wrongful termination based on gender, pregnancy, childbirth, and related medical conditions.
Title VII of the Civil Rights Act prohibits discriminatory firing at the workplace because of an employee's religion, ancestry, or accent.
The Civil Rights Act, Title VII, prohibits workplace discrimination and wrongful termination based on race, perceived race, or marriage to someone of a particular race.