why does the author say that it is better to interact with nature rather than people?

You can probably figure out what he is getting at in these quotes re. nature vs man.

“To be yourself in a world that is constantly trying to make you something else is the greatest accomplishment.”

"The earth laughs in flowers.”

“Adopt the pace of nature: her secret is patience.”

I'm putting a source-link for these little quips that you can follow. Just consider his point of view as, generally, "the world of man imprisons and the world of nature sets you free."