This is false. For example, it's not contradictory to believe in Keynesian fundamentals and supply-side economics, if you think tax cuts would indeed stimulate private spending to the point of increased tax revenue (which actually did happen when marginal tax rates were cut from 91% to 70% as was done in 1964[0]). You can also be a Keynesian and believe in a balanced budget, if you think deficits are causing inflation that the Fed needs to keep interest rates high to fight, and thus those high interest rates are suppressing private sector economic activity (as was true in the 1990s[1]).
The Great Recession has caused the bizarre circumstance of a liquidity trap[2] -- simply lowering interest rates isn't stimulating economic activity, and inflation is low. The Keynesian prescriptions for this are unconventional monetary policy (the Fed's "quantitative easing," which can be done because there's little risk of inflation) and government fiscal deficits (to make up for the lack of consumer demand). Somehow this gets warped into thinking that people like Ben Bernanke and Paul Krugman think you can solve any economic problem by printing dollars and/or getting into more debt.
[0] http://en.wikipedia.org/wiki/Revenue_Act_of_1964
[1] http://www.washingtonpost.com/blogs/wonkblog/wp/2012/08/06/w...