Problem is, you didn't present it in terms of insulting talent or sounding worse, you presented it in terms of "authentic". What's authentic is a matter of perception, because everyone considers their old-fangled technology to be more authentic than the new thing, and it's just a spiral of hipster pretentiousness from there on.
Also, autotune can be used for things other than correcting tone, it can be used as an instrument in and of itself. Whether it's good is up to debate, but that's a good thing -- it enters the realm of taste at that point. A skilled artist could use it well for that purpose. Just like a skilled artist can use photoshop for things other than touching up bad artwork.
However, I would like to point out one thing about people as a whole. They don't bother to pay attention to things like the progress of how a song is made. They only care about the end result. They don't care if a picture is touched up with photoshop. They don't care if a musician is touched up with autotune. They just care that what they listen to sounds good to them.
I don't like it, either, but it's not exactly my place to tell the majority of a population that they should value my opinion over theirs, regardless of how educated my opinion is, right?