Women seem to overestimate their own looks

On Blind and various other online communities...
I don't understand the women who write posts like this in the first place, but
in posts where they list their specs and ask to be compared with men,
most of them are very generous when evaluating their own appearance.
They say things like:
'I've never heard anyone say I'm unattractive'
'I get told I'm quite pretty often'
'I often get told I look like someone'
They talk like this a lot.
I haven't seen a single person say they aren't good-looking.
I wish they would at least provide objective indicators, like 'I was a campus ambassador during university.'