They have no idea what Erdogan's actual reaction was, despite their imaginary sources.
Erdo’s reaction might have looked like, the often played clip of Hitler’s rant!
Trump’s letter appears designed to ensure complete rejection by Erdogan. Any appearance of accepting Trump’s demands would be career suicide for him. I’m not one to attribute genius to Trump’s every move, but once real world circumstances force Erdogan to back down in Syria, he will loose a lot of clout in Turkey, and be shown to have overreached.