David Olusoga explains it all to us:
In the second half of 2020, one strategy for filling the post-Brexit blame vacuum was tried, tested and war gamed, all of it executed with levels of proactive forward-thinking and strategic planning that the government struggled to muster when dealing with the pandemic. New enemies were identified and the attack lines against them fine-tuned in the focus groups.
Firmly in the crosshairs are black and brown working-class people, who are to be stripped of their class identity so that their interests and their histories can be falsely presented as a dangerous threat to those of working-class white people. Hence the demonisation and deliberate mischaracterisation of the Black Lives Matter movement. But among the new enemies are academics and, in particular, historians, whose work focuses on the histories of empire and slavery. They and the institutions that have commissioned research from them have been subjected to a new order of hostility. Expect more of the same in 2021.
What he actually means is that some people have been Meanies to him and not wholly, entirely, unquestioningly, accepted his view of past events. And how Blue is that?