Everyone has a breaking point with varying degrees of threshold levels among us.
Some have a very low threshold of tolerance and patience and with these people, if they're a part of our lives, walking on eggshells around them is often how we deal with them or we try to avoid them whenever possible. We have a greater tendency to try to please them because we don't want to deal with them when they're displeased. We hope to avoid a combative confrontation.
Some have a high threshold of tolerance and have a lot of patience. These people we can easily take advantage of and not necessarily realise we are, until that is, they reach their breaking point and usually, a person with a high threshold learns how to hold inside themselves a number of things they've tolerated, put up with, until they reach their breaking point. Then watch out because all they've kept pent up, they will likely unleash and show their accumulated frustration all at once.
People with a low threshold, we expect frequent adverse and angry reactions from. But, people with a high threshold, we suddenly are taken aback when they react to us adversely and then, we think they've gone off the deep end, when really they've simply reached their breaking point.
I think the best to try and cultivate for ourselves is the 'middle ground' and try not to expect someone else to accept/put up with something we wouldn't likewise accept or tolerate ourselves. We should cultivate tolerance and patience but not to the point where we don't establish boundaries for ourselves, thus letting others walk all over us as a result. ..And the Golden Rule we should always apply. ♥