New York State Labor Law Re Resignation and Collection of Final Wages Owed

I understand New York is "employment at will." For the employee,this means I can resign or quit without giving 2 weeks notice.I understand giving "notice" is a courtesy.This was a nasty, malicious and verbally abusive employer which is the reason why I did not give 2 weeks notice as I did not want to go through 2 more weeks of abuse and the possibility of him not paying me anyway.I just provided him with a written, immediate resignation letter and left immediately.His attitude was that he was "owed" his 2 weeks and he was upset I did not give it to him;he may not pay for the last week of work out of spite.There was no written or verbal agreement that I would provide any notice on termination/resignation.What is my recourse against him?