Why are people so obsessed with mixed babies/kids?

It's like the first thing people comment on about interracial couples is how beautiful their children are gonna be. I get from people all the time when I'm with my boyfriend. I see it more in social media too now. I had came across a whole page on Instagram about swirling just to make babies. I can't find it now (I wanted to link it so bad) but it was a pretty obsessive, lowkey hateful page.
Why are people so obsessed with mixed babies/kids?
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