Thank you for posting your question about part-time holiday pay.
There are no state or federal laws that mandate paid holidays, however some employers offer paid holidays as an employee benefit. You may want to share this article with your employer to see if they might be willing to update their policy. https://fitsmallbusiness.com/holiday-pay-policy/
In most cases paid holidays are offered to full-time staff, or to staff based on their work schedule. Your best option is to read you employee handbook or any other new hire documentation to see if you qualify for your companies’ paid benefits based on your part time status and schedule. It sounds like the employer does offer paid holidays, but has limits on whether part timers receive these paid holidays. Unfortunately, this question can only be answered by your employer, or by reviewing your employer’s documentation. Best of luck you you,