To me the answer is obvious: they were not taught, as I was, that making personal remarks is rude.
I am 5 ft 2, so for years had to put up with remarks about "short people" quoting a song that basically says short people have no reason for living.
Redheads are another group that have to put up with personal remarks too.
Those who pass such remarks think they are oh, so witty and funny and that there is something wrong with us when we feel they are just downright rude.
What did you you think you would have by your current age that you don't?
Best Supermarket Substitutions?

