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.
They say, "Work hard in silence, and let your success be your noise.".
So, you are right that those who have confidence in themselves and know how they are doing it is the right way to do what they are doing, and that they don't need to seek recognition for it because once they succeed, they will get the recognition they deserve based on their actions and success. You are not doing it right if you are seeking for validation instead of focusing on what you are doing, that's not the right way to do something.
A professional trader, someone who is an expert in trading and knows everything about the market, will not acknowledge himself as a pro-trader, they won't say they are the best and no one can beat them, but they will do their work, they trade, and when they make profit successfully over the course of their trading career, people will say he is the best without him having to ask them to say so. That's how it should be.