I don't have to imagine. I've been the first or only Black person in more than one company. I'm already the change I want. I'm just waiting for the rest of y'all (not necessarily you) to catch up.
And plenty people of color put on race blinders or never encounter any issues, but that doesn't mean hostile environments do not exist. In my personal experience, it varies wildly from city to city and company to company. I've worked at companies that celebrate black history month and companies where white managers think it's fun to touch black women's hair.