Some believe he was mad at his men for allowing Schofield to escape from Spring Hill to Franklin.
I've never tried to trace down the source for the claim, but I wonder if it actually came from something Hood said. The problem is compounded by his gross incompetence; was it disciplinary, or just a stupid move? Hood's career was pretty rife with the latter, and it would be no surprise to learn that his men would generate rumors like this; not too difficult to believe that even Hood might have started the rumor to excuse a bad tactical decision.
The site doesn't source it, but maybe it's worth looking into some more. If I find time today (not likely, but who knows?) I'll see what I can find.
I don't know the details of the battles, but Hood lost 11,000 men in two attacks near Atlanta against Sherman in July 1864. The Battle of Franklin was just another example or the problem with Hood's tactics. Was he mad at his men against Sherman too or just slow to understand what he was doing?
In defense of the attack philosophy, a Southern colonel observed that the South generally faced larger, better equiped, and better supplied armies and had to take more risks to overcome what would otherwise be the inevitable result of those advantages.