Can a U.S. citizen applying for China visa in Hong Kong(not resident of Hong Kong)?

Hi, I am a U.S. citizen traveling in Thailand. I was planning on traveling to Hong Kong, applying for tourist visa to China there, and traveling to China. However I have heard the Chinese Hong Kong consulate will not accept visa applications from people other than residents of Hong Kong. Is this true? If so can I apply for a visa to China in Thailand?