Why do I get shit for being an atheist but it's not such a big deal for guys?

Literally at school, the topic of religion came up and I said I am an atheist, and everyone just stared blankly at me, but when my friend said he's also one, they just said "cool" and continued the conversation. My friend and I were both dumbfounded

Why do I get shit for being an atheist but it's not such a big deal for guys?
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