The stewardess will be responsible for your safety, but the ordinary waiter will not. After professional study, flight attendants have different services and different knowledge. In fact, the flight attendant profession itself belongs to the service industry, and its purpose is to serve passengers well. When passengers need them, they will stand up for the first time. As for what customers call them, in fact, they just don't care, just do their job well.
For new flight attendants, they are relatively energetic and may not adapt to their own names, but for some flight attendants who work longer hours. Overworked and exhausted, they no longer have time to think about so-called names. They want to know when they can finish their flight and go home early. They care more about the tone of the passengers than the address. It is better to call the waiter politely than to be impatient.
I don't think it is necessary to object to passengers calling flight attendants waiters. If you have time to argue, you'd better do your work and service well. In addition to service, flight attendants also have safety considerations, but passengers often see flight attendants responsible for providing meals. Passengers don't know that all kinds of security checks and preparations are made by flight attendants before boarding the plane. Since the passengers boarded the plane, everything has been done by the flight attendants. In fact, this work is much more complicated. Ordinary waiters can't do it.