Let's pose this another way...
If I was shooting a 50mm lens on 35mm, to swap my camera to 6x6 cm, I'd be shooting with about a 75-80mm lens. For 6x9 cm, I'd need maybe a 90-105mm, for 4x5, a 150mm is the lens. That's the was we figured before digital.
Today, with the 4/3, DX, etc., we're implying the same idea, but using a little different terminology. A 50mm on 35mm would work on a DX frame as though we were shooting with a 75mm to 80mm lens and on 4/3 as though we were shooting with a 100mm lens on the 35mm/FX/Full-frame. The meaning is about the same, though those of us from the glorious days of film (1990s) sometimes get picky...
As for me, I'm shooting both full-frame and DX and it's second nature what lenses I need and use to have a similar angle of view between the two formats.
Neither good nor bad, just a mind set. No reason to take offense or get bent out of shape. As for me, I'd rather be shooting than arguing. So now stop worrying about the terminology and simply go out and create a nice image!