
Being rude to a person is being rude to a person, all evil is evil. And the only thing that could be considered reverse racism is the act of not being racist at all. Your context of reverse racism is just racism partaken by a person of color, racism is racism no matter what color or lack there-of that person is.
I do want to add on that cracker actually comes from “whip cracker” like, an overseer or plantation owner who would physically abuse enslaved black people. So it’s not that it doesn’t have a history or that it doesn’t carry even a negative connotation, but it’s not degrading in the same way, it’s a long-held reaction to horrific extremes of racism.