The irony is that the notion of "Age of Imperialism" is part of a very Eurocentric storyline. It is when a handful of Western European countries started behaving like traditional land-grabbing empires of old for a brief period.

It is a fitting storyline for a British or French school system, explaining their history in broad strokes from their own perspective, but one would expect haters of Western Civilization to be less uncritically Eurocentric if they actually aimed for a more balanced understanding of world history.

Europeans did not invent "Imperialism" in any meaningful sense. They just repurposed a Latin word that sort of described an important dynamic in a historical period of their own country well.