He did? I've been out of the loop for a while.
Who knows. Ross is kind of a big baby about Silver Age and Super Friends. Basically, stuff he grew up with. Also, his OC. He's kind of like Byrne in that his version is the best version. There was that Wildstorm Captain Atom mini, where he demanded to do the variant cover have Atom wear his Kingdom Come outfit, so they changed his whole look in the mini series to accommodate Ross' variant just so that they don't piss him off. Maybe the whole New 52 stuff with different costumes made him spazz out.
I can see now why he and Waid had a falling out. Two sides of the same immature coin.