In Jain Dharma, laughing at another person’s suffering is not considered a spiritually wholesome act. It can increase raaga-dvesha — attachment, aversion, and inner harshness — and this harms your own soul more than it helps anyone else.

If someone has caused you pain, it is natural to feel relief when karma begins to give results. But delighting in their downfall or mocking them is not ideal from the Jain point of view. Jain ethics encourage:

• Kshama — forgiveness
• Karuna — compassion
• Samata — equanimity
• Ahimsa — non-violence in thought, speech, and feeling

Also, if a person is giving empty advice while themselves suffering, Jain teaching would still advise you to remain calm and discerning, not contemptuous. You may silently understand that their words lack strength, but avoid ridicule, pride, or revenge-like happiness.

A Jain way of seeing it is:

• Their bad actions may be bringing bad karma.
• Your laughter or scorn can create new negative karma for you.
• The best response is to stay peaceful, detached, and truthful.

So, the most sincere Jain answer is: It is not spiritually right to laugh at their misery, even if they once troubled you. Better to remain composed and let karma work without adding your own negativity.