I think you are totally justified in how you feel. I would definitely take it up with the owner. If it was my store, I would be offering you not only your $6, but a token of goodwill as well. If things don't improve on your next visit, vote with your feet and go elsewhere. I always try to support independent stores, but if they can't provide good, honest service and treat customers with respect, I go somewhere else.
When managing staff, I always reinforced with them how important customers are....without customers you have no business....