The stars are only for the food. I brought my mom ...

The stars are only for the food. I brought my mom and a friend here for an afternoon tea, the food was great and there were various choices available on the menu, the waiter recommended a few dishes in an appropriate manner.

My mom and my friend came to travel, it was a reunion and they were loving the experience, we spent nearly 2 hours eating and chatting until a waiter came to check in with us, he literally frowned and said, 'I think you are spending too much time on your food' - that made the whole afternoon unpleasant, my mom was pretty upset, she also felt a bit intimidated that I had to tell her he's just joking, we then left the restaurant promptly.
ps. the place was not busy at all, I have booked online in advanced and there wasn't a single condition about dining hours, plus it is a casual dining restaurant

I still don't know if he's trying to be funny or what, but I definitely know it when people are telling a joke, I can take a banter, for me that was just something very unprofessional to say to your customers.