Bradley was also contemptuous of Patton as well. In his third volume on World War II, Rick Atkinson talks about all the U.S. senior commanders in Europe and the reality is that they weren't an outstanding group of individuals. Between the personality issues and the army commanders in over their head and the political give and take it probably added immensely to the casualties.
After being treated like Shiite by his Senior commanders, it is a good thing that history has been kind to Patton and recognizes him for what he was - The best Allied General of the War. Both of my grandfathers served under Patton and both met him a few times - both thanked God that they served under him.
When has it been otherwise?
I blew through the Atkinson trilogy last year, and the ONLY guy I came away with a heightened opinion of was Eisenhower.