I guess other people see it as the guy being too clingy and not getting the message.
These are two entirely different concepts which both carry the term "friend zone".
So now it is the fault of the pursuer for not working hard enough or "screwing up" an initial encounter protocol and being pushed into the "friend zone". Which is like a terribly deep gravity well that the will require a tremendous amount of energy to get out of.
I sincerely hope this trend of reducing every male behaviour to sexism strangles itself.
Unfortunately this attitude is lionized in Hollywood and popular culture ... with the implication that if you dream hard enough, he/she will see: http://www.youtube.com/watch?v=VuNIsY6JdUw
Id written something long and rambly, but to kind of summarize my thoughts, "friendzone" is used in lot of different ways and means a lot of different things to a lot of different people.
It is essentially the same as "my essay was so good why cant teacher seeeee" or "my art is so good why cant people seee" or "I run so fast why coach can not pick me" or any other situation where person have a hard time to accept rejection.
You do not make any service to women by seeing sexism every time a guy does not reacts perfectly.
This places the person who would like to be more than just friends in an uneasy predicament: either keep their mouth shut and preserve their 'friend' title, or profess their true feelings and gamble away having that person in their life anymore.
I feel it's the exact opposite. The entire idea behind being friendzoned is that you can't get out of it and should cut your losses. It isn't considered heroic to "fight" the friendzone... it is considered stupid.
The problem with the friendzone is the power imbalance. If there is no imbalance it is just simple friendship. A few women love the power and take advantage of it just like a few bosses love the power and take advantage of their employees.
If the cool "jock" takes advantage of the nerd who desperately wants to be cool we (society) think the jock is being an asshole. But if an attractive woman does the same thing it is suddenly the nerd who is at fault.