I agree this works on an individual level. But if other people few insecure by your confidence, security or success, they may try to sabotage you. You still need to be aware of this dynamic so that you aren't blindsided people jealous or angry over your success and their own relative failure by which they are comparing you to even you are not comparing them or judging them yourself.

Ehhh, I think I might agree with what you're trying to say, but I don't think I'd say it this way. What other people think of you is a great source of information which shouldn't be discounted. In fact, I think there's a lot of value in soliciting feedback from the people around you.

We have a name for people who don't care what other people think: narcissists.

What I think you're getting at is that you can't please everyone, and there are many cases where risking someone's opinion of you is the right thing to do.