Don't take rejections personal. I guess it was one of your first ones. You will get many more throughout your life, with even more ridiculous reasons (and even more companies will just simply ghost you during the application process). Don't sweat it, just sleep on it, laugh, and move on. It's their loss.

I am flagging this submission, so it won't show up in google (if it gets enough flags). You don't want to copy-paste emails/messages that can easily identify you.

Best of luck with your next application.