You are right about the mentality and some are too stubborn to accept that they are wrong and they need to learn more. They think if they have made some trades in profits they are legends but they don't know anything and not accepting their errors can cost them more.
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Acknowledging themselves as legends and only labeling themselves, not from others, is a mistake that makes them arrogant.
Traders who are really professional and know how the market works, they don't do any flexing and don't think of themselves as trading gods,
they consider themselves to have no more knowledge and have a lot of mistakes so they can continue to be vigilant and correct themselves.