This is good advice. Most people aren’t weird enough to be happy. Pay attention and you’ll notice most of the super weird people, that project their weirdness and wear it openly, are pretty joyful people. They have shed societal expectation to simply exist as they wish to be.
Now there is a balance there, too far in that direction and you sometimes end up unemployed and homeless. But hell, even most van hippies are pretty happy people. You’ve just gotta find where your own balance is on the scale.