Sonic Drive-In

So my husband just started working for the city and his coworkers notified him of the discount Sonic offer to employees. We decided to drop by for dinner. After we ordered the Manager, Bree (231) was very hateful about educating that my husband was not allowed to order after hrs or for me( his wife)..There's a nice way to explain things and that she cannot do. We didn't know anything other what we were told and I've never met someone so hateful about a discount in my life. If it was that big of an issue she could've just said we had to pay the full amount. Instead she took the order after we explained he worked for the City and never said anything till we went to pay. Pointing stating that she would make sure all her employees know and that she won't forget who we are. All she had to do was educate us on the employee discount or even said we couldn't apply it to our order. Instead she pointed fingers and was so awfully rude. I need an explanation on why this is acceptable and what will be done. Regardless I spent my hard earned money here and I can gladly never use sonic again. Thank you.