Those noted are but a very very few.
One of the most common boasts in industry or the construction site is “and I told that engineer yada yada yada”
The capable but broadly uneducated worker boasts of superior knowledge while revealing inferior intellect.
True about braggarts, but colleges don't hand out brains, only certify who has them among the questionable. A guess is around 20% of the 1% crowd did not spend 4 years in an indoctrination camp, nor pay for the privilege.