Yuppies are portrayed fairly by the media. There is nothing for the media to gain by portraying them in a dishonest way. If the media sees that a story can gain them better ratings then they would jump on that. But that is not the case with the portraying of yuppies.
Yuppies are the end result of baby boomer's idealism coming to a crushing end. First there were the hippies, and when the hippies failed, the yuppies came with a "if you can't beat 'em, join 'em" attitude, which later turned to "why join 'em when you can destroy the next generation" - the exact sort of entitlement the hippies thought they had.
I do not feel yuppies are portrayed fairly in the media, but I also feel that the word it self is in pretty bad taste, so this question doesn't portray this group well either. Call them what you want, I suppose, but the truth is, is these people are great for society and it's their open and free thought that has helped mold part of America.
A yuppie is really treated no different than most groups of people by the media. Their lives are boiled down to a snippet of a conversation, a short video or picture, and an attention grabbing headline. Nothing in the media should be construed as being fairly represented, especially stereotyped groups.
Everyone has an opinion of somebody or some group. It really doesn't matter what people think, as long as people believe in what they are doing. The media has a problem with a lot of people and the way they live their lives. Who cares, we can't please everyone all the time. Yuppies will be fine.