Huh? That doesn't make any sense. Photography was NEVER called "painting" as far as I am aware (other than by the linguistic meaning of the term) so why would painters "say the same thing?"
I'm just saying that the two media are sufficiently different they should be CALLED different arts, just as painting is not the same as sculpture, though a better analogy might be watercolors versus oils or such - both are painting but they are definitely not the same art form.
Your take was more literal than I intended, but I get your point.