The racism experienced by black people is throughout their life and is not just individual but systemic. That is why it is so much worse.
So much worse than the systemic oppression of the nationalist community in Northern Ireland?
So much worse than the experiences of the Jewish people of Europe in the first half of the 20th century?
So much worse than the experiences of the Croats, Bosnians, Albanians etc at the end of the last century? Ok sure, we can get all pedantic and claim it didn't fit under a specific narrow definition of racism it was only systemic Ethnic Cleansing. Soooooo much better, phew!!!!
Just like the Batak Massacre in Bulgaria, the Armenian massacre, St Brice's Day Massacre, the dislocation of the Sami. Or revenge massacres like the Brno death march.
Europe has a vast and complex history. Stop making utterly ignorant statements that complete erase the systemic oppressions of people you likely aren't even aware of. It's not your place, or anyone's place, to do that. As for complex histories, that is true of every continent. This awful shit has not just been practiced by Europeans.
Acknowledging that systemic oppression has been experienced by many peoples, and perpetrated by many peoples, does not take away from the validity of the systemic oppression and racism of black people in the west. But denying that it happened to others, does take it away from them. And all it will do is ensure that people are never able to come together and overcome it.