This can end with you.
My American grandfather was very prejudiced against blacks - he would talk about how blacks "smelled" and he would hold his breath around them. I'm embarrassed to tell this, but it's true.
My Canadian family never agreed with him, but there was no arguing with him, it would have just led to fights and friction. I always viewed him as a product of his times. I just always hoped that his prejudice would die with him.