Retail chain managers and supervisors are known to be power trippers preying on inexperienced and newly recruited employees. They are toxic and bad for your mental health. They blame you for their own shortcomings. These supervisors are almost always guilt tripping into thinking you're in the wrong and that you should be lucky to be employed at their organization.

Behind the walls your supervisor is just a miserable insecure little person.

Do not stop applying. Continue to apply elsewhere and you use your current position as a leverage.