It bothers me more that my native heritage was wiped away so I don't have the connection to it. I wish it was taught more in school and society, that people were more aware that culture did exist here before colonization. That the tribes are still here today and have value. It honestly bothers me more when a European said to me how our (meaning American) history is "so young" acting like 1492 was day 1 of history in the "new world".
People being stupid and drunk dressing up on Halloween as caricatures pales compared to the legacy of poverty on reservations or the loss of culture of my own ancestors who were taken and forced to lose their "savage" nature. I don't think we get much of anywhere picking on these superficial issues, the deeper roots of division are what interest me and working to a more knowledgeable and equitable society.
I conclude from what you write, you have native american heritage. And really, it is a shame that these cultures were destroyed. It says all, that today "native americans" are grouped together, as if it was one culture, while in reality it was many different. The same is true for africa, we often group that together, but before europeans destroyed the native cultures there existed a lot of different kingdoms.
And this all is a loss for all of humanity in reality. A diverse and rich cultural heritage is a big boon. Modern cultural products can rely on that. Movies, music, books and even games. Look alone how God of War forms a cultural heritage that wasn't destroyed into a great game. There are cultures that are not existing anymore, but their heritage is in parts intact. Take Babylon, Sumer, Ur. The Gilgamesh-myth is still known today. How many myths like that are now lost forever, because american and african cultures were destroyed?
And it should be more in our minds how badly american and african people were treated. We have in germany a culture of remembering what we did to jews, roma, gay people and communists. School classes have days they travel to the former KZs and learn what happened there. Do similar things happen for native americans and africans? I think we should all be aware of the crimes our ancestors commited. Not to feel guilty (I was and I am no Nazi), but to learn from it and learn to avoid similar things happen in the future.