I hear you, one of my girls refuses to eat treats, it's difficult to please her!
No matter what i try, she gives me the most disgusting look, she will eat milk drops for dogs, and baby waffles for humans, sometimes she will have a piece of a dry tea biscuit to please me.
If i dont have any baby waffle, or if i think she's had enough, she will pout.
It doesnt get better, she's always been this way.
Good luck! And welcome to YT!!