linux

There are no beginner GNU/Linux distributions

I see this so often and it's so wrong. That if you know GNU/Linux, you must switch to Arch, Gentoo, Fedora, OpenSUSE or at least Debian. That if you use Mint or Ubuntu, you're not a real GNU/Linux user.

A Reason to Call it GNU/Linux

Linux isn't very Unix-like by itself. Of course, it's a Unix-like kernel, and it does Unix-compatible file operations, process management, and system calls, but without the GNU suite or some other userland, it is just a kernel which doesn't have to be used as a Unix-like one.