Garbage. A red stripe from a peach switch..so what? Bruises are another matter. The problem is the idea being sold that ANY physical punishment is criminally prosecutable, including a palm of the hand vigorously applied to the ass (bare or clothed) of the misbehaving party.
Watch any mother animal discipline her offspring. The female of any species WILL apply physical discipline to her progeny, and not gentle discipline, either. Yet she will, by the same rules, give her own life to defend those same progeny.
I watched two sisters-in-law raise their kids. One didn't believe in physical chastisement....only mental. The other applied the old hand-palm as indicated. The children of the first were (and still are) huge discipline problems, though fortunately never to the point of criminality. The children of the second are successful, well-mannered adults.