What is one of the six haramitsu, “humiliation”?

I read your question.
You probably know that patience is the greatest virtue of Rokuhara Mitsu. Of the six haramitsu, all five virtues are the foundation of wisdom. Wisdom is a necessary function to reach enlightenment, isn't it?
Therefore, humiliation does not mean that you must endure anything; it means that you must endure for the goal of “enlightenment.”

There is an anecdote from the Zen sect that an old monk called Jimei Zenji reached enlightenment, so when he was attacked by sleepy demons during zazen meditation, he stabbed a cone in his thigh and devoted himself to ascetic practice.
This is for enlightenment, which is the ultimate goal, so it has been positively transmitted to the present day, but regardless of enlightenment, if you stabbed yourself with a thigh just to wake up sleepy, it would just end up being a dangerous thing.
Of course, the teachings of Buddhism can be applied to everyday life, but they are basically teachings for the goal of enlightenment.
Therefore, in order to make use of it in everyday life, if you think about “enlightenment” by replacing it with a “goal” or “purpose,” you will be able to make use of it in a way that is closer to the essence, and I think there will be less confusion.

Mandatory rules for “people” will be created if you get used to carapo or put up with it. That would be ridiculous.
Buddhism is not a “principle,” so it is not something that people do by repairing or teasing others.
Instead, “not standing up for me” is humiliating.
It's natural patience, natural humiliation.
Natural patience is maintaining the original silence of the heart.
My current location is Sayama in Saitama Prefecture. There is a Self-Defense Forces base, so airplanes are flying all the time.
People who come from far away are surprised.
However, we only said, “Speaking of which, I heard the sound of an airplane just now.”
The sound of trains is commonplace for people who live in places called “under guard.” It has become a part of our lives. Furthermore, when you were reading this sentence now, you must have forgotten such humiliating things that happened in the past. It seems that this state of affairs when they have forgotten is being tolerated.
It seems that the natural quiet beauty of humans due to human nature has been fully realized.
Even now, a new plane is flying above me.
I haven't picked them up much, so I keep being humiliated.
Humiliation is not an act of taking the “I'll do it now.”
It's about maintaining the natural silence that was originally inherent in nature.
When you say “Oh, I'm worried about the customer next door...” at a restaurant, once you start to worry about it, your brain takes those people into the ring.
Now look at what's behind your left and right.
There must be something whose existence itself has been forgotten.
That is what it looks like when it has been humiliated.

This is Kawaguchi Hidetoshi. This is my humble answer to the question.

As for what kind of things we should endure, it is important to seize the full details of Mitsu Rokuhara if possible and try to understand the specific things again.

So what I would like to recommend is “Iribosatsu Gyoron” by Daishi Shanti Deva (Jakuten).

The entire Rokuharamitsu, including Ninjure Haramitsu, is composed of detailed and easy-to-understand poems, so the Japanese translation is also easy to understand.

“Accurate Reading: Shantideva's Procession” (Potala College Tibetan Buddhism Series 4, Tibetan Buddhism Promotion Association)

“Tibetan Buddhism: Living the Bodhisattva Line: Careful Reading: Shanti Deva's “Iribosatsu Gyō” (Dai Falinkaku)

is recommended.

If it's up to chapter 8, you can still read it for free on this download page.

There is also a chapter on Ninjure Haramitsu.

His Holiness the Dalai Lama Japan Representative Office · Various sutras PDF download
http://www.tibethouse.jp/about/buddhism/text/

Ninjure Haramitsu Chapter
http://www.tibethouse.jp/about/buddhism/text/pdfs/Bodhisattvas_way_JP_chapter6_201612.pdf

Kawaguchi Hidetoshi Gassho

I'm saying don't lose heart no matter what happens.