Why do infertile people get offended when someone tells them the positive things about it?

This seems to be the common reaction. Usually they don't want to hear anyone saying ''but you can now date childfree men/women'' or ''I wish that was me, girl/bro you're lucky''.

Why don't they want to hear the bright side of being infertile? Not being able to have kids isn't the end of the world. I get that it sucks but at least they don't have to worry about getting pregnant nor impregnating a woman.

Why do infertile people get offended when someone tells them the positive things about it?
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