I made a meal with gluten that was supposed to be gluten free.
why did you add gluten in the meal?
He wanted me to make something else, but I didn't want to.
You're being mean and dishonest to him. You should respect his meal preferences. If he has an allergy of gluten, it could be life-threatening.
I gave him an option: he chooses between getting nothing, or getting something that he can eat with an allergy.
He's not choosing if he's affected by gluten. If you're going to be that horrible then you shouldn't make anything for anyone with an allergy.