Family Dollar complaint: Service denied

I was in your store picking up some hygiene products and some junk food when I went to check out the total came to 20.61 I reached in my wallet to pay for such items and was denied for trying to cash out with a 100.00 note the older woman said we don’t accept 100.00. Dollars or 20 dollars items, I was flabbergasted, I kindly explained that if your a cash credit business that you would have to accept any form of use currency , the woman behind the counter Escalated the situation and told me to get the f@@k out of the store And don’t come back I responded I’m in the marines as a Military police officer and my full time job is a lawyer for the federal government that this isn’t right and left while she continue to swear and yell , such a poor representation of your employee, the employee is about 5ft 7 in short hair curly and middle aged White needlessly to say I’m. Not happy about this and debating to file a federal lawsuit