what most don't understand was that Jim Crow was much more than simply segregation. It was in place to preserve and reinforce a racial caste system that is the USA's open wound to the present day. Jim Crow included both laws and social customs. Here are some examples--
Social customs:
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.
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.
Laws:
Barbers. No colored barber shall serve as a barber (to) white girls or women (Georgia).
Burial. The officer in charge shall not bury, or allow to be buried, any colored persons upon ground set apart or used for the burial of white persons (Georgia).
Buses. All passenger stations in this state operated by any motor transportation company shall have separate waiting rooms or space and separate ticket windows for the white and colored races (Alabama).
Child Custody. It shall be unlawful for any parent, relative, or other white person in this State, having the control or custody of any white child, by right of guardianship, natural or acquired, or otherwise, to dispose of, give or surrender such white child permanently into the custody, control, maintenance, or support, of a negro (South Carolina).
Education. The schools for white children and the schools for negro children shall be conducted separately (Florida).
Libraries. The state librarian is directed to fit up and maintain a separate place for the use of the colored people who may come to the library for the purpose of reading books or periodicals (North Carolina).
Mental Hospitals. The Board of Control shall see that proper and distinct apartments are arranged for said patients, so that in no case shall Negroes and white persons be together (Georgia).
http://www.ferris.edu/news/jimcrow/what.htm