Why? It doesn't say or imply anything about white people, or that white people are racist. It just says that a white person who is racist is very cliche typical American. So it's an anti US comment, but it's not racist (as it doesn't say anything about white people that aren't racist, they're not just "typically American".
As a german, born and living in the region Trumps family originated from, I officially distance us, Germany and Rhineland-Palatine, from Family Trumpf!
It could have been when people started bringing up his and his father's racism, and that his father was arrested while marching with the KKK. And reports that the only book he ever read and keeps by his bed is Mein Kampf.