He's wrong, but not for what Ultimate Paragon is thinking. Fact is, Tumblrina would be right if they added "of the United States" onto every use of the word white in that post. But they didn't, and now they're saying whites in Zimbabwe, China, and Japan never experience racism or discrimination, which is absolute bullshit and offensive to white people who have suffered in places like the Kongo.
You're half right. American whites don't experience racism on an
institutional level (except
maybe for affirmative action), but it definitely happens on an
interpersonal level. Just ask Eminem about the racially-motivated bullying he suffered as a kid.
And whites do suffer from police brutality. While it's unlikely that more than a couple cases (if that) were motivated by racism, that doesn't diminish what they suffered.
As for "nobody was murdered for being white", that's simply not true. Robert Rozier killed seven white people in order to join the Nation of Yahweh. Colin Ferguson shot twenty-five people (six fatally) on a Long Island train because of his hatred of whites, Asians, and "Uncle Toms". Two examples, just off the top of my head.