Why is there a double standard with Trump and the stock market?

Avalon - Why is there a double standard with Trump and the stock market? He has boasted "bigly" whenever the market has gone up, and yet he takes no responsibility whatsoever now that the Dow Jones industrial average has dropped over 2,000 points in the two biggest 1,000-point loss days ever recorded. Even worse, he suggests, along with his Fox News main propagandist, Sean Hannity, that stock market losses are Obama's fault for his low-interest borrowing practices. In his endless blame game when things go wrong, Trump exemplifies hypocritical and cowardly leadership at its finest.