That was a favorite training/instruction method of my dad, during my younger years. Watch me screw up, then criticize harshly (many times in front of friends, neighbors). He liked to say, “boy you are thick”. His poor teaching ability did encourage me to explain clearly, calmly skills, work/job procedures to younger, inexperienced people, for the rest of my life. I was determined to be a better version of him.My dad when questioning why I did something.
Me: "I thought......"
Dad: "You thought, when you should have been thinking!"
Never made any sense to me.
He was a mean ba$tard.
Never gave advice but would always say:
"I could have told you that was a mistake!"
A lot of good it did me after the fact.