What Bhagavad-Gita says about responding to those who hurt you? Do we need to stay calm and get hurt again and again untill our life ends and get the whole life spoiled because of bad people? Or else do we need to wait for the God's next incarnation? Or else leave them saying that God will punish them after death?
How to rightly act in a given situation, is part of Dharma. Bhagavad Gita doesn't discuss on general Dharma in the scope of prakruti. Refer:
What is Dharma according to the Bhagavad Gita?
According to Gita, a person doesn't "act" under his own will.
BG 5.8, 5.9 — "'I' certainly don't do anything" is believed by knower of fundamentals (tattva gyAna) - even while seeing, hearing, touching, smelling, eating, moving, dreaming, breathing, talking, discarding, accepting, opening, closing; -- "Senses only are acting in the subjects of senses" - is understood.
Hence this Qn may not be in the scope of Bhagavad Gita. You may want to ask from the perspective of Dharma ShAstra to get the precise answer.
However, for your specific Qn during Gita's discourse Krishna does ask Arjuna to fight without giving way to weakness:
BG 2.3 - O Partha, yield not to unmanliness. This does not befit you. O scorcher of foes, arise, giving up the petty weakness of the heart.