When is discrimination wrong?

A law requires black bus passengers to sit in the back of the bus and white passengers to sit in the front.A school principal asks the students with last names beginning with A-M to sit on the left side of the auditorium and those with last names beginning with N-Z to sit on the right side.An employer at a casino requires female employees to wear makeup and prohibits male employees from wearing makeup.A nursing home with a predominantly female clientele refuses to hire a male nurse's aide for a job requiring assisting residents with bathing and toilet needs.A personal advertisement under "Men Seeking Women" in a local paper reads: "Looking for a single woman, age 30-40, for a long-term relationship or marriage.Seeking a woman who is not afraid to be feminine.Prefer someone slim, who wears makeup and likes to dress fashionably."A worker who is biologically male but dresses and lives as a female requests that her employer designate some bathrooms as unisex or alternatively allow her to use the women's bathroom.The employer refuses and instructs the employee to use the men's bathroom.The employee refuses and is fired as a result.The U.S. Food and Drug Administration approves a drug specifically for use by African American heart failure patients.