I see this a lot. I've been drinking Diet Coke, probably ever since it's been on the market because I prefer it, I'm not over weight. You may come upon me eating a huge meal sometimes and drinking a good old Diet Coke with it. Regular colas are way to sweet for my tastes.
When dining in the south, I do not order the famous "sweet tea" either, way too sweet.
I hate it when I do that, I do know the difference between "to" and "too". It was a typo, I swear.