Why girls are surprised when I tell them I have no social media accounts?

I meet girls here n there then we go through random conversation sometimes I take their numbers sometimes they ask my Snapchat or IG which I don't have one when I say I don't have one they're like are you serious! And most are not even believeng it. Why? ! Personally I highly value my privacy and I don't like to be on these social media
Why girls are surprised when I tell them I have no social media accounts?
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