Oh for goodness sakes, and you accused ME of taking things to an extreme
No, of course, I would not pat myself on the back is a child's face fell in response to any comment I made. But I would not feel it meant the comment was an issue and I should ever comment on a similar thing to another person. I would think the child seems very insecure, or petulant (depending on the face) and not generalize it to others. And, I CARE but I do not think I (or anyone) should be required to try to guess what random things people might be insecure about, things that are not normally issues for normal people with halfway decent self esteem. How could I possibly guess them?
Interesting example you picked about unusual names. Mine is Hadley. Until about 5 years ago most people had never heard of it. Most people comment on it being unusual. Many ask where I got it from or ask if it is a boy's name or whatever. I never mind at all and am happy to explain that i am named after Hemmingway's first wife.
My kids have unusual names too (Marika and Rio) and both get comments on them and neither has ever seemed to mind.
My husband is 6'5" and very broad shouldered and people comment on his size all the time, he takes it as a compliment and has no issue with it. Oh, and lately people tell him he reminds them of the actor who plays Marshall on How I Met Your Mother. Again, he is fine with it and plays it up.
The concept of being upset with someone for commenting on an obvious feature, unless the person was just really rude and said something like "what an ugly name, why on earth would your parents give you that" or "OMG how horrendous to be so freakishly tall" is just completely foreign to me--and the concept of justifying that type of reaction if my child had one and wanting others to stop making normal conversation is even more so.