You hear this soft, inflected tone everywhere that young people below, roughly, 35 congregate. As flat as the bottles of spring water they carry and affectless as algae, it tends to always trend towards a slight rising question at the end of even simple declarative sentences. It has no timbre to it and no edge of assertion in it.
The voice whisps across your ears as if the speaker is in a state of perpetual uncertainty with every utterance. It is as if, male or female, there is no foundation or soul within the speaker on which the voice can rest and rise. As a result, it has a misty quality to it that denies it any unique character at all. It is the Valley Girl variation of the voices that Prufrock hears:
I know the voices dying with a dying fall
Beneath the music from a farther room.
It's parting wistful wish for you is that you "Have a good one."
Above all, it is a sexless voice. Not, I hasten to add, a "gay" voice. Not that at all. It is neither that gentle nor that musical. Nor is it that old shabby lisping stereotype best consigned to the dustbin of popular culture. No, this is a new old voice of a generation of ostensible men and women who have been educated and acculturated out of, or say rather, to the far side of any gender at all. It is, as I have indicated above, the voice of the neutered. And in this I mean that of the transitive verb: To castrate or spay. The voice and the kids that carry it is the triumphant achievement of our halls of secondary and higher education. These children did not speak this way naturally, they were taught. And like good children seeking only to please their teachers and then their employers, they learned.
There's more, and better. Go and read.