I'd ignore it...if he asked again I'd get him a kilt and we'd watch Braveheart together...if he asked again I'd get him some boxing gloves, enroll him to the local boxing club and then watch all the Rocky Movies with him...if he asks again I'd take him back the hospital and say they'd made a mistake!
Looks like your beliefs are more important that your child's happiness, good that not everybody is like you. You do resemble to the radical Islamists I can see.