Why do some people get so upset when they find out my husband and I don't want kids?

My husband and I have both been sterilized and have been together over 10 years. We have no regrets and love our life together. So why is it when some people find this out, they respond with hostility or condescension? It affects you in zero ways. Makes as much sense as getting upset at someone at subway for ordering a different sandwich than you.

Why do some people get so upset when they find out my husband and I don't want kids?
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