I have to point out that this is a Wise One teaching method. When Egwene was chastised by one of them during one of her unsanctioned meetings with Nynaeve and Elayne in "The Shadow Rising", she was told that "a harsh lesson is best". Each of the Wise Ones, if you recall, recalls scenes where another Wise One had to treat them extremely roughly in order to impart a subject lesson.

In fact, I find it odd that this scene is recalled by critics so vividly when they forget that Nynaeve and Elayne's lack of this lesson in being more careful is what got both of them into trouble twice: Once when Elayne was almost killed when she was hit on the head with a cudgel by a pick pocket and again when Moghedien was able to track them when they momentarily dropped their cover. This same lesson was imparted much more terribly when Nynaeve was too hasty in hunting the Forsaken, and nearly cost Birgitte her life/existence.

Hate the need for the lesson, not the teacher. Better in the world of dreams by a friend where the memory can be imparted without the damage, then in T'A'R by an enemy or the real world. Plus, Nynaeve remembers this scene with no rancor, proving that she did need the lesson in order to develop further. No reason, IMHO, to act angry on her behalf when she herself did not feel angry over it.