SmashBurger review: Attire and cleanliness of employee

I was at the 32nd and Youngfield Wheat Ridge CO on 4/16 at noon. The female employee at the register was friendly and dressed appropriately for customer engagement. Brian (I’m guessing the manager on duty) had very dirty jeans on that purposefully showed all customers his underwear. It was unpleasant to view while waiting for my take out order. I’m thinking there should be at least a minimal dress code for employees? Come on Smashburger!