This is such nonsense. First of all, there are absolutely people who come from dirt poverty and become wildly successful. Second of all, plenty of people receive lots of help from their parents and amount to precisely nothing. IMO it's fair to refer to your success as "self made" if you exceed the median success level of your class peer group by a substantial margin. If you immigrate from Africa with nothing, and you…
Whereas if you believe that you can build yourself up through effort and exertion, and believe that those things are the primary factors in your success, you have no excuses if you fail. You might still fail, but at least it won't be for lack of even bothering to give a sincere effort.
And I don't know about you guys, but I'm OK with failing if I fail for reasons that are totally outside of my control. What I'm not OK with, is failing because I didn't make a sincere effort within the scope of the things that I can control.