Why are guys so obsessed with the "friendzone"?

A few months ago I posted a picture on Facebook right after my boyfriend had proposed and under it I wrote "going to marry my best friend"
And now, a few months later, I saw that same picture appear on the hotpage of some meme site where someone put a comment under it saying "He made it out of the friendzone"

That's not how I meant it. We were never just friends, I just meant we are friends as well as being lovers.

And I see posts like that a lot, where girls post something fairly ambiguous or just where a guys does something nice for a girl that isn't his girlfriend and loads of guys will complain about being in the friendzone and just jump to conclusions
Why are guys so obsessed with the "friendzone"?
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