Mine were like that with grapes...until I squished the grapes. Now they love them and I no longer have to squish them. I think they just didn't get that they could get to the delicious innards if they pinched a little harder.
My DH cut the grapes in half and we had to try several colors of grapes before they would eat them. If there are seeds in the grapes, they'll ignore the fruit. The smaller the grape size the easier for them to break them apart to eat - but no seeds please LOL. Grapes drives them all into a frenzy. Our Ameraucana is the only one that likes the sweet cutup dates. She's like Mikey - she'll eat anything and sometimes gets the others to try new foods.