The reactions this movie generates are funny
For the record, I'm not crazy about the movie or Sean Penn's direction. But its ideas of purposeful isolation, the abandonment of society, of rejecting career, family, etc. really offend people in a huge way. I can't help but laugh about it.
I think there are many who probably relate with Chris and his alienation. And if you have never felt that disillusionment and it seems completely foreign and weird to you, thank the universe for blessing you with a level of psychological contentment that not everybody has.