Why do millennial white girls hate other white people so much?

I'm white I know why. But you wouldn't believe me if I told you. Most were raised by white christian parents. A lot of boomers are not at all racist. (because of the 60s and the civil rights movement). It's just the christians. The KKK (the Klan) is a christian organization. They don't treat their own children very well. That's putting it politely. I'm a boomer you ought to hear my story. It's a shame what's really going on in this world. The pope owns the whole world and we are all his slaves. Look up the spanish requirement. Then the divine right of kings. You will get the picture. There is a website called wicked sheppards.com You can look at what they have to say about all the churches being in error of what Jesus taught. It does not matter if you are religious or not. You will be enlightened by looking at this information. It will not change your beliefs in any way. It will only make you stronger in your commitment to whatever you believe. I am an atheist by the way. The way to fix it is to join the freedom religion foundation go to their meetings. They support people of all colors. We are all one race. The human race.

Perhaps they learned it from their boomer parents and genX professors/teachers...

The vast majority do not. 

They grew up in an anti-white era.

As a millennial white girl I find your absurd and unfounded generalizations to be quite bizarre and not worth considering any further.