Yes, I completely understand, however, I feel many adult interviewers do not realize how discouraging they may be with their words. Whether or not an applicant gets into the school, their job is to “sell the school.” They must make it seem like the best place for the applicant to have continued interest. “Oh, our kids are so interested in the STEM program and we really make coding a huge part of the curriculum!” Or try to build off of your kid’s interests.
If the interviewer feels strongly that it is not a fit, then it is a different story, and still there is no need to disrespect the kid.
Honestly, I really admire you and your son for your determination to follow through, even after such an interview. Your outlook is really refreshing, and taught me to see how the interviewer is not always like a school