I was born in 1952, and it was all true.
We learned that white men won the American Revolution with guns, and then we won the American West with guns, and then we beat the Germans with guns in WWI, and then we beat fucking Hitler AND the Japanese with guns in WWII, and I grew up in a culture where to be a white male with a gun made me a freakin' apex predator. I was an NRA sharpshooter when I was 10.
And even though the Declaration says "all men are created equal" and there were fits and starts in that direction, everyone knew the truth, that white men ruled the world. White male Americans most of all.
'Course, in my teens I became a counterculture affiliate, and had to re-learn a lot of stuff that I thought I already knew. Unlike a lot of my fellow white men, I grew up in the world, with my eyes open to reality. In fact, at my age, white men have become a horribly abused minority.
So I understand these assholes, to some extent. This is not the world we grew up in. It doesn't seem fair. But honestly, if you are lucky enough to learn anything about the planet you were born upon, you should learn that everything changes, and the trick is to navigate the changes.
I mean, sheesh.