But tokens are just text! Isn't it all just text? If you're training and you encounter "the", is that an instruction "the" or a data "the"?
Think of how an image of a car and a car in front of you may look indistinguishable in 2D -- but due to your 3D vision you know they're not the same thing (but also know the image is of a car, while not literally being a car).
Likewise, blue tokens are the image of red tokens.