Short people. You can measure a person’s height and look at a chart to determine if the person is short.
poor people – are people living in poverty poor? Their are guidelines for who falls under poverty level.
Sick people – A doctor will diagnose a sick person. Insurance has coverage for sick visit or well visit. there are hospitals for mentally ill.
Stupid people. There are measurements for IQ.
I have never ever heard of guidelines, measurements or levels for what constitutes ugliness. Facial ugliness is an opinion only.