The average young adult in America does not expect a near-stranger to comment on how warmly he is dressed.
I think that the root of this discomfort is the emphasis of independence in American culture. To comment on someone's lifestyle is to suggest that perhaps he hasn't quite made the transition into adulthood. The boxes of macaroni and cheese, the baskets of dirty laundry....these are ignored. We focus on the accomplishments and refrain from criticizing adults.
Contrast this with the fact that in Russia you have several generations living under one roof, and you have a different story.
To make a long story short, I often have the experience of being "mothered." Think of a mother hen and you will have a pretty accurate picture. I'm often told that I've gained/lost weight, asked what I had for lunch, quizzed on some other rather intimate details. Maybe a curious hand reaches out to feel the thickness of my jacket, making sure it is warm enough. +/-