''White dominant culture, or whiteness, refers to the ways white people and their traditions, attitudes, and ways of life have been normalized over time and are now considered standard practise in the United States.''

Notice the language they are using. They speak of white culture being 'normalised' as if that were a bad thing. This is obviously false, because our culture is responsible for so much of humanitys scientific and cultural achievements, and because we tend to have the most successful nations.

Whoever made this chart is trying to pathologise white culture.