For them there were no norms or standards, other than what they might choose to agree upon among themselves. You have to realize that for these existentialist thinkers, all human activities were equivalent in value. Today we see many young people caught up in this attitude of cynicism and despair. They just don't care anymore. Life has become jaded.
Many young people pass their time in a fantasy world of drugs, music and sex.
Man is an empty bubble floating on a sea of nothingness. Not only do the existentialists have to create a set of values to live by, but first of all, they have to create optimism out of a view of absurdity and despair. It is called an ethic of ambiguity because each person has no one to answer to but himself. There is no one else to blame, each individual is without excuse. Life is merely a game to be won or lost, to seek to become one's own hero.