poor customer service

Today I went to burger king with my partner before we place our order we sat down, were in the middle of a conversation we were there for approximately 10 minutes and a security guard approached us and told us to order something or leave,we told him that we going to order shortly we were still discussing something and he said we not allowed,so my partner told the security guard to call the manager and he did a lady that didn't even look like a manager came and said the same thing that the security guard said. She said it's their rule because majority of people that go there don't buy food they just sit and leave.we were so disappointed,I mean how could they treat their customers like this.they don't know what excellent customer service is.the place was so empty I am sure they doing the same thing to all customers.they going to loose lots of customers.so we left,went to eat somewhere else where they know how to treat customers.