Thanks for suggestions. It helped me to come to a solution within myself. But this kind of thing is beginning to be more common.

Yesterday I was sitting with my son in a mall bench waiting for my wife to finish her shopping when a fat cauke woman called out about "immigrants.. go back to your country." as she was passing by. I didn't want to create a scene infront of my son so kept quite. I don't think my son heard her or understood her and he carryed on with his story that he was telling me about pokemon movie he had seen.