My former company wants me to pay back tuition reimbursement that I don''t feel I owe them for many reasons. No one has paid this company back for

The outcome of this matter will not be determined by whether you "feel" you owe the money or not. As a general matter, the terms of the tuition-reimbursement plan will control. If other employees have not been required to comply with the terms of the plan and you have a defense based on discrimination, you will bear a relatively heavy burden of attempting to prove your position, and you will need to show that the discrimination was carried out on a basis prohibited by law (e.g., race, religion, etc.), rather than simply employer preference. There is no law that prohibits "harassment" unless founded in sex-based discrimination. All of these matters will place you at a relative disadvantage to the employer, which merely needs to show that the money is required to be repaid. Consult a labor attorney if you are sued or wish to negotiate a settlement.