How Should I React?

What should i do when someone is standing near your look weird like suffer in pain but after awhile he like a happy person without any worries.
and the incident keep on repeating? what should i do? keep the bias perception away...i don't care is real or not. but how should i react?
i today done a cruel things....i ignored that person. because i using the bias and stereotype of perception. i choose to ignore because i believe everything he done is a LIES and Drama.