It's typically used to trivialise the view that discrimination and prejudice are wrong. It's a cliche and meaningless, and gets thrown in when the argument has otherwise been lost, very often by people who would love to be just a little bit racist/sexist/homophobic, cause a little bit of "harmless" offence, have a laugh at people because of the colour of their skin and not be frowned upon.
It's typically used to trivialise the view that discrimination and prejudice are wrong. It's a cliche and meaningless, and gets thrown in when the argument has otherwise been lost, very often by people who would love to be just a little bit racist/sexist/homophobic, cause a little bit of "harmless" offence, have a laugh at people because of the colour of their skin and not be frowned upon.