"You have such potential if you'd just stop squandering it."
"If I had just a fraction of your talent..."
"The problem is that you never take anything seriously."
The steady drumbeat of some statements leave stains on our souls that we'll spend our lives trying to wash away through punishment.
The craziest part is that these "encouragements" wouldn't help a neurotypical person either. They can only be interpreted as malicious. The way to encourage someone properly is to praise effort, because praising output actually leads to worse results in general.
They're a societally approved way of venting frustration on others for failing to achieve what the speaker thinks they should have. It's sanctioned abuse under the guise of tough love because it offers no empathy, no aid, and no meaningful attempt at dialogue.