The manager wouldn’t be talking to Washington DC, but to the credit card company, as I would be the one reporting the store for violation of the agreement with the credit card company. Believe me, that works every time... :-)
Please call your credit card company and tell them that the Federal government requires you to show ID. I am not arguing with you that you have done it many times. I am just saying we are required to check your ID and I am sure the credit card company will not be wanting to lose our business. We just tell customers, “Sorry, you must show ID or produce another form of payment. If you don’t, we cannot sell to you.”