Obviously, I can't speak for everyone, but I feel the vast majority of Americans are fine with legal immigration. With that being said, even though the Haitians in question are legal, placing 20,000 immigrants of any country into a town of 60,000 is going to have a profound effect on that community whether it be good or bad. Any immigrant will come from a different culture and do things differently than US citizens. They have vastly different life experiences, beliefs, etc. I don't think it has anything to do with race or color of their skin. Place 20,000 white as snow Russians in that community, and you are going to get the same thing.
I'm not sure why they chose Springfield nor why there were so many placed there. Seems like they could have been placed in smaller numbers in many different cities/towns, communities to lessen the effect. At the very least, are they getting any guidance on culture differences from the Biden administration? Are they just dropped off and expected to learn of all that stuff on their own? With a ratio of 1 immigrant to 3 citizens in that small community, I expect patience is wearing thin probably on both sides.