Why is there such serious discrimination against white Americans? For example, look down on the Irish and Italians?

It is normal. Even in Europe, great European countries such as Britain, France and Germany have never looked down on southern Europeans, thinking that they are lazy and useless, while southern Europeans look down on Slavs and think that they are uneducated. In the United States, the British and Germans (including Austria) are relatively strong white groups, as well as Jews. A large part of America's elites and rich people come from these groups. In American cities in the 1930s, the slums were basically Irish immigrants and Italian immigrants. The landlord can look at "There is a Tree in Brooklyn", which reflects that the protagonists of poor families in American cities in the 1930s and 1940s were Irish, not only Americans, but also Europeans during the Hundred Years' War between Britain and France believed that Irish people were not trustworthy. President Nixon even boasted that Irish people would become very despicable after drinking, which caused public outrage in Ireland. Italians wander in American society, idle and lazy, form mafia, participate in kidnapping, drug trafficking, gambling and fight with blacks and Latinos from Latin America. Italians are basically involved in large-scale gangs in the United States, which is harmful to social security.

In fact, this phenomenon will happen anywhere in the world, just like the regional conflict in China.