Do some whites feel guilty over past wrongs against blacks and try to give leeway to blacks as a result?

Is it true that sometimes a white person will be treated rudely by a black cashier at a fast food restaurant and not complain about it because they feel that blacks have a right to be that way? Is it true that sometimes, if a black co-worker raises his voice to a white person, the white person will let it go since he believes that black people have a right to be angry? Is it true that there have been times when black people have threatened white people with violence and the white person did not report the incident since he thought that black people have been treated so unfairly in the past that they should be given some leeway? What is the name of this phenomenon, if it exists? Is there a related phenomenon called "white guilt"? Is it true that some white people feel guilty for past wrongs committed against blacks? Do they fear that black people might ge angry and give them leeway as a result?