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On Monday, a series of mobile billboards outside an elite private school in New York City chanted their "awakening" curriculum and "diversity rather than indoctrination."

Six Manhattan high schools including Dalton, Trinity and Briarley were targeted, and the trucks were marked with "Teach how to think instead of what to think" and "WOKE SCHOOL? Speak out."

The $10,000 campaign was coordinated by an anonymous group, Prep School Accountability, and attracted the attention of parents, who regretted the inclusion of controversial anti-racist ideas in the school.

"I am a minority. I grew up in this process and I think it will make more differences," a mother of two girls attending an all-girls private school in the Upper East Side told the Post.

"It's too much. We got it, but we are in New York City-unlike other places-let us start learning again," she added.

Dan Ladner has a 6-year-old daughter who is studying at Horace Mann, and he agrees that the "wake up" course may have adverse consequences.

"You must do things well, you must not belittle anyone for any bad reason, and you must also respect everyone's opinions," he told the Post.

"I think it comes down to basic common sense. If the thing waking up alienates people and makes people feel uncomfortable, it's wrong, but if it gets everyone together and thinks it's good."

But other parents raised objections to mobile billboards, especially billboards that said "diversity is not instillation".

"I think this is too exaggerated-if someone has seen the course-they will realize that the course is a diverse course. It brings together authors and scientists from all over the world, and it has nothing to do with indoctrination," Brill, Upper East Side Said David Foster, a seventh-grade student at Leigh School.

These signs came as tensions between Manhattan’s top private schools increased—a father even pulled his children out of elite Brearley schools because of race-related courses.