That’s a good point, there would be many many exceptions to such a prediction.
So at most, all I can say is that the racists in heaven are unlikely to find much in the way of 20th century ideals until people from the 20th century start dying and showing up there.
Who would teach them? The more severe racists from periods even further back?
Maybe the dead of other races, provably ensouled and with barriers to communication magically removed.
I think the assumption is that divine beings would be there.
Are you assuming people from the past are always more racist for any given time period?
That’s a good point, there would be many many exceptions to such a prediction.
So at most, all I can say is that the racists in heaven are unlikely to find much in the way of 20th century ideals until people from the 20th century start dying and showing up there.