When challenging an adult who has discriminated against another group of society requires a slightly different approach. Time and place is paramount. It is unlikely to be appropriate to speak in front of children, however if the comment was made in front of children then you need to act quickly and show to be firm but polite and calm with regards to the adult's intolerance and that their behaviour or comments were offensive. As with children, you could correct the adult and give them the right information as so they do not cause offence in the future with such comments. Should a person be directly affected by the offensive words and/or actions then you should offer them support and inform them of how you intend to do something about it as so it should not ever happen
When challenging an adult who has discriminated against another group of society requires a slightly different approach. Time and place is paramount. It is unlikely to be appropriate to speak in front of children, however if the comment was made in front of children then you need to act quickly and show to be firm but polite and calm with regards to the adult's intolerance and that their behaviour or comments were offensive. As with children, you could correct the adult and give them the right information as so they do not cause offence in the future with such comments. Should a person be directly affected by the offensive words and/or actions then you should offer them support and inform them of how you intend to do something about it as so it should not ever happen