I am wondering if he would like it if you soaked it overnight - such as in fruit juice or yoghurt.
They are very fussy. Mitzi will enjoy nuts - walnuts for example - so I buy more of those but then she decides she has gone off them and some other nut are her favourite. She has been through hazelnuts, pecans, walnuts, almonds - both blanched ones and with skin on. Any type of nut she has enjoyed for a while and then gone off just gets thrown down. Monty just eats whatever he can get his beak on but neither of them like brazil nuts.
Somewhere in another universe, dear brother, you got saved.