You could say it shows a general lack of knowledge of a wide scope of history.
Quite so, but as I said this is the history popularised in books, films and television. It always amuses be when yet another documentary or drama is made about the Tudor dynasty. It’s almost as though nothing much happened in between the death of Elizabeth I and WW2!
The fact that we British invented the concentration camp during the Boer War is seldom mentioned. Or that the biggest act of mass genocide was perpetrated not by Germany but by Belgium!
Would we have had the same furore if Lineker had tweeted about the policies of Leopold II? Of course not.
But let’s not forget that the tweet was about the language used, not the resultant atrocities. And in that respect he was right.