It's obviously true that nobody achieves things in a vacuum. We all have some level of "privilege" given to us by our economic circumstances, the level of education available to us, our luckier heritable traits, etc. But for every successful person, there are countless others born to a similar level of privilege who squandered it. The claim that everyone owes their successes to the group ignores this.

Go back a few generations for just about every wealthy family in the US, and it's nothing but slave (or highly exploitative) labor building on land and resources stolen from the indians. It's the uncomfortable answer behind the question of "Why do WASPs own everything?". The whole "self-made" myth is nothing but a byproduct of white guilt all the way down.

Anyone who claims to be self made is dishonest to themselves. "No man is an island, entire of itself; every man is a piece of the continent, a part of the main" -John Donne

Excellent essay

Few myths in our society are as dangerous and as anti-social as the “self made man”. No one is self made and all achievements are the result of groups of people working together.