Probably not what you want, but a useful term (this from Wikipedia):
In the field of psychology, the Dunning–Kruger effect is a cognitive bias wherein people of low ability suffer from illusory superiority, mistakenly assessing their cognitive ability as greater than it is. The cognitive bias of illusory superiority derives from the metacognitive inability of low-ability persons to recognize their own ineptitude.
That describes a lot of people I know, people who have never outgrown their early teen years.
This is the correct line of thinking. But can it be reduced to a single two word nomenclature such as Cognitive Dissonance?
You set me on the path to discovery. It’s Cognitive Bias as used in: [barf alert] ... skim real fast and don’t focus on their usage.
https://www.huffingtonpost.com/david-macaray/the-dunningkruger-effect_b_4476166.html.
I needed the phrase to explain to my son vis-a-vis gambling in general, poker to be specific.