When a waiter asks, "Is everything okay?" or a similar question like "How is everything?" during your meal at a restaurant, they are typically being polite and genuinely interested in ensuring that you are having a good dining experience. They want to make sure that you are satisfied with your food, drinks, and overall service.
The question is open-ended, meaning it can elicit both positive and negative responses. If you are enjoying your meal, it's common to respond positively, such as saying, "Yes, everything is terrific, thank you!" or something similar.
On the other hand, if there is an issue with your meal, something you dislike, or any problem with the service, the waiter also wants to know about it. They ask this question to give you an opportunity to express any concerns or make requests for improvements. In such cases, it is entirely acceptable to provide honest feedback, but it's important to do so politely and constructively. For example, you could say, "Actually, my steak is a bit overcooked," or "I think my drink is too sweet, could I have less sugar in it, please?"
Waiters are there to make your dining experience as enjoyable as possible, and they appreciate feedback to address any issues promptly and to meet your expectations. So, if you have any concerns, feel free to share them, but always maintain a courteous tone.
In short, while the question is often asked as a courtesy, it is a genuine inquiry and can have a negative response if you have any legitimate concerns about your meal or the service.