As a child it’s basically your parents supporting and believing in you (helps being good at something). As an adult it’s being really good at something and working on your childhood trauma of not supportive parents.
I don’t really get your point - since not being insecure just helps generally in life. And it’s always good to work on ones insecurities - be it just for oneselfs peace of mind.
There is no objective taste reality, so there is no false reality. Taste is a complex experience of actual taste, aroma, texture, memories (your grandma used to cook that way), setting, hunger (ever been hungry on a long hiking trip?) - what ever combination gives you pleasurable experience, tastes good for you.
For the starters, men need to learn to talk about sex. I never had a useful conversation about sex with other men, with women sure easy topic (just don’t be a creep).
Or the best phrase ist: there is no point in generalizing literally half of human population.
And the point with confidence is more that it makes your whole life easy(not just dating) - since you are just not really afraid to fail no matter the odds, but it’s really difficult to develop as an adult.