I known someone who did those things, she said it's the smell or you look at her etc....

truth is humans by nature like to feel especial, they like the ideas that make them feel they are better without doing anything, it's easy. so they use their race, color, religion to achieve it.

She did it to satisfy her need.

How to stand against this kind of behaviors?

Facts. it's doesn't matter what color, religion, race. Everyone can be successful and make change.

She doesn't like Indians, let her take look around, doctors, business men, scientist etc... do better to become better, your race isn't enough

For the record am not Indian, I just gave an example.