What about "I don't like it?"
I try to use (and promote a use of) non-judgemental statements.
"It's gross", "she is ugly", "that's stupid" can be replaced by "I" statements, describing how "I" see it.
What's gross for one is delicious to another.
I don't see the point of not allowing a child to have an opinion on what they like/dislike or will eat/not eat.