What do you think about men wear flip-flops on first date?

Lg_Laugh
He is German men. We meetup 2 times. He weared t-shirt, capri pants, flip-flops.
I felt a bit he is not seriously about meet me.
Hope I'm wrong, is it normal?
I don't mean wear chic. I just think should wear polite on the first meet.
Updates
+1 y
And he rarely chat with me on Skype. So I don't know much about him, and I don't feel like him more than before we meetup.
What do you think about men wear flip-flops on first date?
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