As much as Luther said many wise things, he said some pretty stupid things too. Here is one of them
I would rather have pure blood with the Pope, than drink mere wine with the
Enthusiasts. (Luther's Works, 37, 317)
Most of those who repeat this saying like to sharpen the division between Luther and the Zwinglians (read - the modern evangelicals). IMHO, the people who repeat this saying usually are high church people, as if by repeating this saying it would bolster or strengthen their position or their program.
I am just wondering, why they do not also repeat what Luther said about the Jews and Germans . They don't, because common sense says that those statements are stupid comments nurtured and blurted out of frustration.
Just have a bit of horse sense, you become stupid when you agree with stupid statements.