We all have our own triggers. I would have not been happy with that woman's comment. I order hamburgers plain because I do not like pickles or raw tomato - or lettuce not in a salad, for that matter. I have been asked if I really want "nothing" on the burger. Only once did someone say "you really don't want the tomato? Or the pickle??" with this look on her face like I was STRANGE for not wanting them. I did let this one pass, because she did see to it that the burger came plain. I was more bothered by the expression/tone than the actual question. But in this case, "like a kid" would have rubbed me the wrong way too. For me it's a personal thing - I have a number of food aversions, mostly due to texture or taste. My "food menu" was much more limited as a child, and I constantly got told "just try this" "you'll like it" "Eat it or else" by various members of the family, immediate and extended. SOME foods I have learned to mostly enjoy in small doses (bananas, yogurt, etc) and others, like that marshmallow-fruit-salad concoction someone makes every 4th of July, remain on my "no, not ever" list. But that was as an adult. I STILL, as an adult, got comments about how "little" I ate. I proceeded to spend about five minutes listing everything I do eat - which is rather exhaustive - until the person in question threw up her hands and said "Okay, okay!"
Point being, I don't like having my food preferences/aversions commented upon, even in a fairly innocuous way as that waitress did. That would have dropped my tip to the minimum I will give (10%) and I probably would avoid that restaurant/that server in the future.
