"I want to, again, give America some words of advice", the spokesperson went on, urging the U.S. to "stop hyping this so-called "militarization" of the South China Sea - don't continue lying through your teeth".
"China won't be scared by any so-called military ship or aircraft, and we will only even more staunchly [take] all necessary steps to defend the country's sovereignty and security, to protect the peace and stability of the South China Sea region", she continued, according to the news service.
CNN reported that the two aircraft flew within the vicinity of the Spratly Islands, where China has reclaimed land and built runways and other facilities on disputed reefs and small islands.
The B-52 Stratofortress is the US Air Force's largest bomber and serves as part of the United States' "Nuclear Triad" of forward nuclear weapons deployment.
One of China's man-made islands in the Spratly Islands.
China claims nearly the entirety of the sea - resource-rich waters that include some of the world's busiest shipping lanes - despite overlapping claims from neighbours including the Philippines, Vietnam and Taiwan. Were the B-52s there for freedom of navigation and overflight?
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James Mattis, the USA defence secretary, has denounced Beijing for its "militarisation" of the South China Sea, through which $5 trillion of worldwide trade passes by ship each year.
China's islands have been steadily militarized since construction began in 2013.
Mattis said at a security conference in Singapore last weekend that China has deployed anti-ship and surface-to-air missiles on the disputed islands. During the drills, pilots also launched simulated strikes on naval targets.
"Running amuck is risky", Chinese Foreign Ministry spokeswoman Hua Chunying told reporters, Reuters reported.
"China's policy in the South China Sea stands in stark contrast to the openness our strategy promotes".
Despite Beijing's protests, U.S. Defense Secretary James Mattis has said America will continue to conduct such operations and "compete vigorously" if needed.
After two American warships sailed close to the Paracel Islands last month, Hua said Washington's accusations that China is destabilizing the region are "preposterous, just like a thief crying "stop thief".