I’m the exact opposite actually. I never liked the taste of regular coke, too sweet, so I’ve been drinking Diet Coke since I was a kid. Drink a couple of liters per week (although I’ve cut down since inflation has made it cost as much as liquid gold). I dislike the fake sweet flavor of Coke Zero, but I love the more refreshing taste of Diet Coke. It’s like sparkling water with caffeine.
I do realize the taste of Diet Coke varies quite a lot over the world, but in Western Europe it tastes perfect for me.