Aspartame has a pretty strong, weird metallic flavor to it, and a lot of the sugar alcohols taste... idk, like a belch after a slightly sweet chemical cocktail? Some taste... airy, or dusty, like an absence of flavor, like there's a gap where you'd usually taste something. Hard to describe but very unpleasant. And the flavor lingers for quite a while. Xylitol is mostly alright tho, sadly it's usually blended with other stuff nowadays.

Personally though I think stevia might be the worst, and it's getting added to everything lately, even stuff with more than enough regular sugar.

Honestly I'd prefer to not taste that, since I think most probably are pretty safe and fine (though I would be glad to see a reduction in sweetness in general). But it's really not a choice, nor have I "gotten used to it" in 40 years, despite it being extremely common.

That's exactly my experience. What's interesting is that the taste is also very similar to the taste/sensation I get when I have a viral infection.

You're underestimating how gross it was to me at first.

When I drink a non-diet cola, it tastes awful to me; sickeningly sweet. I don't have any problem with diet colas (though I don't like Diet Pepsi, it's slimy to me).

The main point is that it's not that X has an awful taste. It's that different people have different reactions to different Xs. It's not that X tastes bad unless you happen to get used to it.