Indicators like nonverbal language exist and then there are certain things we attach to personality traits like wearing a trump hat but also when you prejudge a person you change your own behavior and increase the chances for the outcome you expect based upon your judgement
Its a good lesson to teach kids, because human's first instincts is to always judge and believe first impressions. This is obviously not a good outlook on life and will lead to issues and unnecessary conflict.
But yeah it is kind of bullshit once you are able to understand that first impressions CAN be wrong.
Also, children don't dress themselves usually. So the advise is definitely more relevant as a child than an adult working retail.
And honestly the OP should have a 95% accuracy if they are seasoned in retail. As a former retail worker, those skills were ingrained after the first month working there. It is actually baffling how easy it is.
It's mostly to try and say that ugly people aren't bad people, because there's a natural human instinct to be drawn to pretty people with symmetrical faces. That's why it's a simple message for children. As OP said, with experience you learn more and you can draw your own conclusions.
Judging them by the first 5 minutes of interaction is the cover. As a fast food employee you’re not going to learn that they just got fired from their job and the divorce was just completed today and the wife gets all the kids.
The rule that the way you go into the interaction reciprocally influences the way people interact with you might be more important here. So if you treat ppl with the expectation that theyre gonna be dicks, guess what, theyre gonna feel that and probably wont be too pleased about it and behave accordingly.
With exposure to neurodivergent posts online, it became apparent to me that even interacting with people is an unreliable way of discerning someone's character.
Some people are highly anxious, which can manifest in all sorts of ways, from seeming like an asshole, to being erratic and sketchy.
I'm sure we've all had situations where we said something, later realizing how it could be misconstrued.
Then we've got people with autism, schizophrenia, ADHD, depression, etc.
And that's without mentioning the personal circumstances of the day, week or month.
Just don't judge people if it's unlikely to cost you anything.
Choose compassion, patience and respect. You will never know the plight of a stranger.
I think the phrase has the same basic problem as a lot of common advice... the real truth is more nuanced than any pithy phrase could ever be. At best, it's a quick way of reminding someone who already knows better but has temporarily forgotten.