So first, people who don't have a problem with sugar or their health, they don't drink artificially sweetened drinks.

What a bogus claim! Plenty of people drink artificially sweetened drinks because they don't want to enjoy a soda but not add calories to their daily consumption! Which world do you live in? Have you even been to cinema lately? I bet every other person orders a diet soda before entering the theatre. I know because I see it happen all the time all around me!