You're wrong too, GNU refers to the toolchain in this case and BusyBox is a program not the OS; they are nothing without the kernel.
What IS an OS is a somewhat open ended question but I would consider the sum of the parts (kernel, drivers, toolchain, etc.) to be the OS.
Also holy shit, even you acknowledged this is just a bit of banter. I get sarcasm is hard to pick up on over the Internet but I feel like the other replies should have clued you in. You don't need to be a smartass about this shit.