I’m not sure if I ever heard that one, but that’s indeed nonsensical. ISO 216 is a very nice system, though, and used in most of the world, not just Europe.

In Bash you can use a shell option to alter this behavior: shopt -s nocaseglob. See https://www.gnu.org/software/bash/manual/html_node/The-Shopt-Builtin.html for more options.