I don't agree that white people in general are anywhere near being like they were in 1870. Those articles from 1870 were blatantly prejudiced and disgusting, and nothing today even comes close to that in newspaper articles. To make a general statement that nothing has changed because a comparatively small percentage of white people are still like that is what people think is unfair. I think there is a perception that things are equal to what they were 150 years ago but in reality they are far from being that way today. Back then a majority of white people were prejudiced to a very horrible degree that we thankfully don't see today save for a much smaller minority of the white population. That's why I don't feel it's fair to say that nothing has changed. It only hasn't changed for a small percentage of people. Most people today find that deplorable.
I didn't personally see any comments on the FB page from white people that showed that they wanted to justify mistreating people in 2018. I don't doubt that there were, but maybe they were removed from the site. But just because there is a relatively small percentage of white people that hold those views is no reason to make a general statement that can be taken as inclusive of all white people. That's the only thing I or anyone I saw post on that page would say, not that there's any justification whatsoever for mistreating black people in 2018 or 19 or ever. I know I was not alone in taking her comment that way. Perhaps you didn't, but that's your opinion which I don't share.
For example, there are still people out there that believe the world is flat or the sun revolves around the earth. I don't think it would be fair to say that "nothing has changed" since Copernicus just because of that group of people. A lot has changed. Focusing on the injustices alone only keeps people in the mindset of victimhood. And Regina is far from a victim in my opinion. Her wealth and fame plus the great advances in civil rights in this country have made that possible. I understand looking at the past and seeing the similarities to the present, but I would have preferred she used a different way to express it. The way she worded it made it sound like she's blaming all white people for a situation that's caused by a smaller subset of the white population.