Is it a red flag if someone already likes you so much before getting to know you better?

I mean if they already like you so much before they really know you ( enough dates / start being together ) .. That means they like the idea of you.. Not really you.. But actually the picture of you they've already created in their mind.. And if it turned out to be not what they fully imagined.. well, You know the story... It gets so toxic...

Is it a red flag if someone already likes you so much before getting to know you better?
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