Why do older people think it's ok to call adults younger then them kiddo?

Anonymous
I hate being called that. I'm not a child or a kid. I see that word used on this site from older people quite often. I find it more of an insult saying me or that person is just a kid when we're adults. Also I don't like the word itself, sounds stupid.
Why do older people think it's ok to call adults younger then them kiddo?
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