I know that, most technical people know it, but I refuse to call it "GNU/Linux" because that's a dumb name and Richard Stallman is so over the top pedantic to constantly insist on it.
Like, I'm glad for the solid kernel, but it's just not what I interface with on a daily basis. Same that I'm glad the car engine is running fine, but I care about the car, not the engine.
You wouldn't tell your mom about this great operating system she should use named "GNU/Linux". That's bad marketing.