Yeah, 'groomers' is a good term for them. The parents have a right to be damned mad.

Teachers at a school district in Wisconsin are being instructed to hide their students’ changing gender identities from parents on the grounds that “parents are not entitled to know,” and that it is “knowledge that must be earned,” according to leaked training documents.
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One of the slides in the training session reads, “Remember, parents are not entitled to know their kids’ identities. That knowledge must be earned. Teachers are often straddling this complex situation. In ECASD, our priority is supporting the student.”
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During training on microaggressions, Eau Claire teachers were taught about the differences between microinsults, microinvalidations, and microassaults. Examples of microaggressions that the training noted include: the concept of color blindness, or that “America is a melting pot;” the “myth of meritocracy,” or the belief that “the most qualified person should get the job;” assuming any student’s gender; and “sexist/heterosexist language,” including “being forced to choose between male and female when completing basic forms.”