You are free to criticize America. People, including politicians, regularly do so. China, despite claiming to be a strong, ascendant power, is remarkably sensitive when it comes to such fictions as there being one China or the historicity of their nine-dash line.
Also, though the USA certainly was a conquerer -- few powers on this violent planet were forged in peace -- it's also the foremost defender of the modern rules-based order. There are Hawaii and the Mexican-American war in its past, but there are also Japan and Micronesia closer to today.