Girls, Why is it weird to wear a push-up bra in public?

I have been buying new types of bras recently and they come with a push-up section. I don't know why but whenever I wear them people look at me weird. They think it's nasty to wear something like that. It's not my fault that the manufacturer wanted to put a push-up section into a bra. I wish people would mind their own business.

Girls, Why is it weird to wear a push-up bra in public?
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