It causes me a lot of mental stress when I observe that as Shia we are often ridiculed and at times even killed. What is the best way to deal with it?
Bismillah
Thank you for your question. Persecution has been an unfortunate aspect of being a Shia throughout most of the Muslim world for a long time. Indeed the Ma'sumin (as) themselves faced these issues and so the best way to deal with such things is to take their (as) example. Remain balanced and faithful to the religion of Islam and empathise with your fellow Shia in times of difficulty. Pray for the Shia and for the return of Imam al-Mahdi (af) and turn to Allah for the solution. Where you can help alleviate the difficulties, which is sometimes even with a kind word, then be that source of help and encouragement. And know that God will never forsake those who are faithful and will recompense all that have suffered on the path of truth.
May you always be successful