I think that depends on the context. I think when it comes to colouring, people generally wish they had something other than what they have. Like I wear blue contacts cause I find my eyes boring. SC is like the opposite. He has green eyes but he totally wants my brown ones?
Otherwise, I think it's just preference. I mean I love wearing brown but others don't. Also, maybe people associate it with negativity because they think 'dark' but really its warm ^.^ Brown's kinda awesome ;P