In Tuesdays with Morrie what does Morrie mean about people buliding their own little subculture?

Earlier in this section, Morrie is talking about how he
believes in the inherent good of people, but admits that society is what destroys them. 
He argues that humans become "mean" when they are threatened, and gives the example of
how money drives our culture.  When it comes to making money and keeping it, and the
possibility of losing it, he basically explains that people only look out for
themselves.

The "subculture" he advises Mitch to build for
himself then, is one that obeys society's basic rules, but does not allow society to
deem what is important for individuals.  Essentially, he's telling Mitch to create his
own values or his own set of things which are important to him.  He specifically advises
him against letting what is popular among everyone else be the determining factor for
what is important.  He then uses himself as an example of someone who has been able to
do just that.

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Here's what I mean by building your own little
subculture," Morrie said. "I don't mean you disregard every rule of your community. I
don't go around naked, for example. I don't run through red lights. The little things, I
can obey. But the big things- how we think, what we value-those you must choose
yourself. You can't let anyone-or any society-determine those for you. 
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