Cats can't taste sugar/sweet, so it does not mean anything to them.

They can eat ice-cream, cake, popsicle etc but its not really good for their eyes. Also, this kind of sweet stuff has so many chemicals inside which can be dangerous for their health, because they are not designed to eat such things and may not have the defense in their body for such chemicals. It may not show in the next day of course but it will probably effect pets lifespan in long term.