Flavour Metal Core Why Does Diet Coke Taste Different From A Can Then From A Glass?

Why does diet coke taste different from a can then from a glass? - flavour metal core

I hate, I hate to drink Diet Coke, even in the cold and still tastes gross weired. I can only drink once floated on the ice for several minutes. Why are so many different tastes, even his cold in the can? Is it metal? WNY Change the taste though. another game?