Earlier quoted context omitted.
One thing I've found again and again is that a lot of advice is good for some people (even most people) but terrible for others. It all depends where you're starting.
What is an example of a person for whom this is terrible advice? I can only jokingly think of people who are naturally hostile or low on EQ. "They can't handle all this!" kind of people.
It's a good approach for someone who's already developed those social skills and wastes a lot of time second guessing themselves, but it's a terrible approach for someone who's really immature or unpolished. It gives them carte blanche to dismiss all conflicts and disagreements as being someone else's fault.
I've known too many people who will formulate vast and complicated worldviews to explain away all their personal troubles, before they'll ever consider looking in the mirror and admitting that they might be able to improve some things about themselves. Example: incels and redpillers. They will change their view of the entire world before they consider changing their view of themselves. Someone who habitually blames everything on other people is unlikely to ever perceive their own faults, and may even embrace them rather than grow out of them.