Angry parents gathered Monday night to protest a California teacher that read transgender books to her kindergarteners and encouraged a clothes-changing demonstration, saying it was inappropriate to vividly portray transgenderism to such young children.

In an alleged attempt to introduce a diversity of opinion, the Rocklin Academy teacher read the kindergarteners two books on transgenderism and let a student reveal her “true identity” by changing clothes in front of the class. To many parents of the kindergarten students, however, the fact that the school board failed to warn them in advance of the teacher’s intentions was unacceptable.