I want to pour my drink out onto the floor.
Why do you want to pour out your drink?
I don't like it and I want a new one.
Pouring your beverage on the floor is wrong. If you are in a restaurant you should simply ask for a new drink. If you are at home you should pour your drink into the sink and then you can get something else.
Meh. I'm going to pour it out anyways
It's will be seen as childish to pour a drink on the floor simply because you want another. If you do this, people will not want to go out with you in the future.