Employment Law Questions? Ask an Employment Lawyer.
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Legally, these businesses have a right to prohibit anyone from coming onto their premises for any reason at all except based only on your age/race/sex/disability/national origin and when they do so a person has no recourse other than to leave and not return.If Joe is making known false statements about you to others, then this is grounds to sue Joe for harassment and defamation for his known false statements and you would have to prove the monetary damages you have suffered as a direct result of his known false statements.
You can seek to sue for the harassment and defamation, but legally they can still prevent you from going onto the premises, that is their right as a business as long as they are not discriminating based ONLY on your age/race/sex/disability/national origin and in your case they are doing it because you are a former employee and they have some problem with you leaving evidently.