I do provide alternates for
true dislikes but require a doctors note for allergies.
If the child ate bananas for the last year, then suddenly does not like them anymore I simply offer and move on with my life.
If a child dreaded carrots since infancy, and I have been well aware of it, I'd offer sweet potato for vitamin A in its place.
I will not give a PBJ every day in place of a complete and varied diet. Yes, I have been asked.