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There was a study done on incompetence. Across the board, incompetent people were found to have an erroneous belief that their ability at something was much greater than it actually was. They also demonstrated consistently an inability to perceive negative feedback in that area.

The point is that this isn't a good or right mindset.
After the law of reverse flexibility the amount of power you have over something rise proportional to the rise of flexibility in that area. That means the more reponses you can generate to feedback whetever it is positive or negative you have available the more you can accomplish. Most people are extremly unflexible and can improved based on a more flexible mindset.

In addition constant and focused effort is more powerfull than unfocused effort.

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So, in terms of mindset and generalization

Thinking that people have the ability to make no generaliziation is irrealistic. If you don't make your generaliziations consciously you make them unconsciously. If you make them consciously your flexibility is greater and so are your results.