I love how they cherry pick quotes out of context to make their point. From the linked article:

Ironically, the US government sent a letter to China expressing concern about its new law. "The Administration is aggressively working to have China walk back from these troubling regulations," US Trade Representative Michael Froman said in a statement.

But if you actually looks into the quote, it doesn't have anything to do with crypto backdoors. From [1]:

“China’s new regulations on the use of information and communications technology in the banking industry go directly against a series of China’s bilateral and multilateral trade commitments. For example, the rules would require technology transfer and use of domestic Chinese intellectual property as a precondition for market access—both of which China has committed not to do,” said Froman.

The rules aren’t about security. They are about protectionism and favoring Chinese companies,” he said. “The administration is aggressively working to have China walk back from these troubling regulations.”

[1] http://9to5mac.com/2015/02/27/china-technology-rules/

They are angry at anyone that does the same as them, nuclear bombs, invasions, crypto backdoors, you name it.

Just wait till the armed drones fly over.

They're angry because this is a copyright infringement to them. The US wanted this first, so nobody else can use it.