It doesn't mean that you are doing anything wrong. Sometimes they just don't like the food that is offered to them, plain and simple. They all have different tastes just like we do! I just posted on your other thread about cup feeding. Maybe try putting a few meal worms in a cup for him to try. Make sure the cup is shallow enough and hang it froma branch so he has easy access to it. Also make sure the cup is not too see through, as you don't want your cham shooting his tongue at the outside of the cup and possibly injuring his tongue. If your cham does take a liking to the meal worms, I would use them sparingly. Keep crickets as your primary feeder and use the meal worms as a treat here and there.