This is where it lost me. I can't agree with this statement.
Many people are savvy enough to know that they're influenced by the people around them. The natural response, of course, is to choose the people in your life, as well as be aware of the pros and cons of having those people in your life.
Most people who have a big impact on the world don't do it alone. They surround themselves by people who help them make that impact. This can be done intentionally. You can choose the "social norms" in your life, simply by changing who you're surrounded by.
So, no, I can't agree with the statement quoted above, for the simple reason that I can (and do) choose the people who influence me. (As do most people, at least to a certain extent.)
Do people choose who they're surrounded by? Of course!
Should people make these choices more consciously? Of course!