Why is it that most people can't understand that just because they think someone is ugly that it doesn't mean everyone else agrees?

For example, I know the difference between when a woman is friendly and just thinks Im attractive physically/sexy, wants me in a romantic or sexual way, etc. I told people how a woman wouldn't break eye contact with me and she was looking at me non-stop for many minutes just smiling. They said she was just being friendly. The thing is what friendly person stares at a person non-stop for Many minutes just smiling like a psycho. I think these people I told this to think I'm ugly physically and just because of that assume even with this (she is just being friendly).

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Looks are subjective. People don't get that. And a friendly person would stare or could stare nonstop smiling for some minutes without breaking eye contact but for many minutes it appears the person wants you in a romantic or sexual way or thinks you are physically attractive
Why is it that most people can't understand that just because they think someone is ugly that it doesn't mean everyone else agrees?
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