My guess is the mother influenced him to dress and act like this, probably to jump on the band wagon in order to be "famous" (probably a stretch). 18 and older you make you own decisions parents forcing (in my opinion) beliefs and ideologies on a child is wrong. The only way to put it
The Dude: And, you know, he's got emotional problems, man.
Walter Sobchak: You mean... beyond pacifism?
Walter Sobchak: This guy f*cking walks. I've never been so sure of anything in my entire life
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