I'm not really interested in having a value judgment discussion of Facebook here, but it really annoys me when people assume this. At least have an open mind enough where you can imagine someone thinking different from you. It really doesn't take that much imagination or empathy to see why some people view it as, yes, completely and totally a net-negative on the world, regardless of whether you specifically believe it or not; I think the good that facebook does do is both incidental and replaceable.
Besides, c'mon, how can you be "nasty" to a corporation? People publicly complaining is probably the only way this change happened in the first place.