Why don't men understand breasts can possibly shrink with weight loss?

Everyone is different, and some lose weight in certain body parts more than others. Breasts contain both fatty tissue and dense connective tissue.
In my case I was overweight at 175 lbs and 5"2. At the time I wore a 36D cup bra. I was properly measured and C cups were too small.

I lost 60 lbs and my breasts were the first part of me to shrink. At 115 lbs I wore an A cup, b cups were way too big! When I explain this to men they seem confused or don't believe me until I show pictures and they act shocked.
Why don't men understand breasts can possibly shrink with weight loss?
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