I'm confused. Are you taking issue with a commonly used word to describe providing food to others because it is etymologically related to words whose connotations you dislike? Or is this about your ill-founded classist prejudice? Or did you just completely and totally miss my point while personally exemplifying it?
I will try to clarify all possibilities. Fine dining, fast food, passing out trays in a hospital, putting mashed potatoes on the plate of your child... these are all examples of serving food. Food is what is being served. You are not subjugated to the food. This is more like serving a volleyball. This is a situation where one word has many different meanings. This meaning has to do with distribution of material, not duty to a cause.
Next, your classism is backwards. Poor and lower middle class people often have experience working in service jobs, and tend to be more respectful and appreciative. People who feel entitled to the most and appreciate it the least are those who are accustomed to actually having servants and they get confused. Not all poor people are kind, but many are because suffering breeds compassion. Not all wealthy people are d-bags, not remotely, but those that are can get away with that behavior more than someone who lacks their resources... at least until they push it too far. Reference:
http://www.cnn.com/2015/02/04/enter...ulting-intimidating-flight-attendants-charge/
Finally, it is helpful to have some work experiences where you aren't guaranteed that everyone will be grateful, because that will happen when you are a physician. Then, even if you don't have an employer to enforce it, your professional ethics should compel you to forbearance and fulfillment of your duties, even when someone is rude, demanding, or unappreciative. Humility is something you will need a lot of, and no, it is not the same thing as humiliation. Also, you need insight into the roles of those around you. A physician's orders alone are not enough to make a patient better. Someone has to carry them out, someone has to create a clean and orderly environment for the work to be done in, someone has to nourish the patient so that they can heal.
If you are already dismissing those other roles as things done by people who just aren't as important as you, then there isn't much hope for you.