Answer:
Japan's fraught relationship with neighboring nations, including Korea and China, can be attributed to its imperialistic agenda during the 19th and 20th centuries. Japan's expansionist aims led to various atrocities, such as the Nanking Massacre and the use of Korean and Chinese women as "comfort women" for Japanese soldiers, which continue to fuel resentment and negative sentiments towards Japan.
Some may argue that Japan has attempted to make reparations and amends for its past actions, but others contend that such actions are insufficient in acknowledging and atoning for the wrongdoings. These sensitivities remain a sticking point in diplomatic relations, and have given rise to territorial disputes with China and South Korea.
While some may believe that it is unfair to continue to judge Japan solely based on its past actions, the legacy of these events remains strong in the memories of many Koreans and Chinese. Therefore, whether or not Japan's negative reputation in the region is justified is an ongoing debate, and continued efforts towards reconciliation and recognition of past wrongs are necessary for progress towards a more positive relationship between Japan and its neighbors.