I've come around on a lot of things, even if I don't like 'em, can wrap my mind around them, but sugar on grits is an abomination.

Other than that, I think the only right answer when someone makes you food is "thank you". If you try it and don't like it don't eat it, that's fine. Just acknowledge the effort the person made to feed you. "EEW" is never appropriate. Even if they give you sugared grits. "Thanks, I'll pass on those, I don't like sugar on grits but please, enjoy. When I cook I'll make them savory so you can try them that way."