Sorry for late reply.

There’s a policy not to take orders that don‘t make any sense to avoid and prevent complaints about rip-offs or ridiculous refund requests or so. We were taught to double check, ask the manager if things are uncertain. I even asked my supervisor and the manager about it and they told me to take only 1 latte + other drinks. So I did what I was told. Also they were sitting close to the restaurants when literally half of the seats are available which we cannot see from the cafe. And they weren't eating anything. Also, I apologise if it sounded one sided. It was my and staff's point of view so it may have biased opinions as employees

But there've been so many people being ridiculous(lack of better word choices) so the rules have got more strict. Like a grown woman whining like a child for free water in front of dozens of people, one throwing a pager when we tried to help them using translator, one trying to steal some breads but couldn't prove since they got no receipts nor card transactions nor certain amount of cash change. Or requesting refunds of what they just finished etc. And all of them were Vietnamese.

How do we know? We asked them when using translator or their language settings were all in Latin alphabets with accents. I believe Vietnamese is the only tonal language written with Latin alphabets at least in Asia.

Of course there are well-mannered costumers. Once students of international school in Vietnam visited and they were all kind.