Why was muhammad upset with his community??

He spoke out against rich merchants, who he criticized as immoral in their greed, and he denounced the worshipping of idols and multiple gods, saying, “There is no god but God.” City leaders became hostile to him, and in 619 his uncle Abu Talib died and was succeeded as head of the Hashim clan

Explanation:

they wanted the u.s. to fight on the side of the central powers.