Why do people hope you grow taller when you still can, but when you can't anymore, they act like it doesn't matter?

I've seen so many threads by teenagers on here, asking if they still have hope to grow despite being short, and people are very optimistic about them being able to grow, implying every last day matters. But as soon as they can't grow anymore, nobody is blunt anymore, suddenly, it's not your height that matters, it's your "personality". As if personality could make a 5'4 guy as equally attractive as a 6'4 guy.
Why do people hope you grow taller when you still can, but when you can't anymore, they act like it doesn't matter?
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