At what point (if at all) does size difference look weird?

I went on a date with a girl who seems really cool and we get along but she's 4'9. Personally I don't care because she's 22 but people had pointed out I look creepy because I'm 6'2. I don't feel the same way and was gonna see what yalls standard is.
At what point (if at all) does size difference look weird?
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