Like you, I found that part of the article confusing, maybe as a result of poor editing. The only way I can see a BPD reacting badly to such a restaurant situation is, for instance, if the BPD (and say, friend or spouse) had called to say they were arriving late, then got to the restaurant and saw that their dinner companions had already ordered food (because it was getting late, they were hungry, and what not); the BPD would most certainly interpret that as rejection even if the other guests had good reasons to have done what they did. It's just an example. In my experience, people with BPD have no tolerance whatsoever. It's all about them. Not their fault since they do not see the world as others do, but it's exhausting nevertheless.