Why would a guy get offended by this?

I had a guy once ask me for my Instagram. I told him I didn’t have one (which I still don’t cuz social media is mentally draining). He got upset and stomped away like a little 2 year old? Like wtf who does that? This man was grown by the way.

Like not every girl has a social media account tf
Why would a guy get offended by this?
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