flower child
flower child {n.}, {slang}, {informal}
1. A young person who believes in nonviolence and carries flowers around to symbolize his peace-loving nature.
Flower children are supposed to be nonviolent, but they sure make a lot of noise when they demonstrate!
2. Any person who cannot cope with reality.
"Face facts, Suzie, stop being such a flower child!"
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Source: A Dictionary of American Idioms