A black male could not offer his hand (to shake hands) with a white male because it implied being socially equal. Obviously, a black male could not offer his hand or any other part of his body to a white woman, because he risked being accused of rape. Blacks and whites were not supposed to eat together. If they did eat together, whites were to be served first, and some sort of partition was to be placed between them. Under no circumstance was a black male to offer to light the cigarette of a white female — that gesture implied intimacy.
Blacks were not allowed to show public affection toward one another in public, especially kissing, because it offended whites. Jim Crow etiquette prescribed that blacks were introduced to whites, never whites to blacks. For example: “Mr. Peters (the white person), this is Charlie (the black person), that I spoke to you about.” Whites did not use courtesy titles of respect when referring to blacks, for example, Mr., Mrs., Miss., Sir, or Ma’am. Instead, blacks were called by their first names. Blacks had to use courtesy titles when referring to whites, and were not allowed to call them by their first names. If a black person rode in a car driven by a white person, the black person sat in the back seat, or the back of a truck. White motorists had the right-of-way at all intersections.
My suburban white friends were so confused that my parents introduced themselves as Mr. and Mrs. and that I always addressed adults that way. They just don’t know. And I don’t know how popular of a trend this was, but some Black folks gave their children honorifics as first names so white people would have no choice but to call them ‘Mister’ or ‘Sir’. Like, I know tangentially of a woman who’s first name is Doctor.