This is as much for myself as for others, as I am naturally impatient and have a short temper. I do not know much about the source linked below, but have not have not seen any negative reviews.  I am not promoting Fo Guang Shan. The guidance simply strikes me a authentic and sincere:

Link to Cultivating Tolerance by Master Hsing Yun

It is about tolerance in the Buddhist sense of Kshanti or Khanti. One of the sino-japanese translations for it consists of two kanji:

  •  忍 meaning to endure, put up with, bear, tolerate, be patient with
  • 辱 insults, abuse, degradation, humiliation, micro-aggressions, triggers, or offenses.

So kshanti means to be forbearing or patient with things that don’t necessarily deserve forbearance or patience. Why do this? Shouldn’t one give as good as one gets and retaliate in kind? There are several reasons I can think of.  Hostile mental states such as anger, resentment, and so on can actually be physically unhealthy. They can elevate one’s blood pressure and be harmful to the digestion.  Moreover, they can cloud the mind and impair judgment.  In addition, enmity is the second of the Five Hindrances or Veils that block spiritual progress. Harboring resentment can also directly give rise to the third and fourth.

As for practices, there might be specific visualizations to cultivate tolerance in the Buddhist Meditation manuals. However,  I do not presently know of any. One thing, any readers who made it this far have at least already exercised a degree of patience.  Master Hsing Yun gives five points in the article. These could be used for self reflection during silent prayers after Nichiren style services.  Also, before or after silent meditation, prayers, other mantra practice, or a walk. Whatever one does.  I would add one thing to number 3.  Do not necessarily take insults too personally. Things are not always about ourselves.  Maybe the person who treated us rudely had a bad day. Or is just a rude person. Also, occasionally inserting a prayer for the happiness of people who annoy us is a good idea, but I would not obsess.