Definition of "RACISM" [Longman Dictionary]
1. unfair treatment of people, or violence against them, because they belong to a different race from your own
2 the belief that some races of people are better than other races
Racism doesn't belong to white people only. Other ethnicities can have racist members within their communities as well.
Even though white people are probably less affected, we should overthrow our US American and European centric views.
The provided definition clearly states that the act of racism is not attached to a certain race only. It depends on the individuals and the community they live in.
If we look into a few recent events in South Africa and Namibia, white people can be effect by racist acts as well... or think of Armenia VS Azerbaijan. They hate each other because of politics, history, languages, cultural heritage, music, etc.
Plus, there can also be acts of racism among white ppl as well (think of some British people treating Polish and Lithuanian migrants after Brexit) or the Slavic and Ex-Soviet countries are very diverse and complex as well and you can find many instances of racism towards various ethnicities.
It really depends on the dominating society within a community/country.
However, racism is ugly and unacceptable anyway and shouldn't be tolerated.