Pew Rsearch Center says:

Over the past year, public opinion surveys in the United States and China have shown evidence of rising tensions between the two countries on a host of issues. These include increasingly negative perceptions of each other and concern over economic and trade policies.

See the results here: http://www.pewglobal.org/2012/11/01/how-americans-and-chinese-view-each-other/#src=prc-newsletter