It's part of a broader program of social engineering/indoctrination in public schools and beyond as is made obvious by the BCTF's "Social Justice" web page:
... an organization of professionals, we accept and act on our broad responsibility to be involved in the social development of the communities and the province we live in, and we do this in the interests of the children we teach. ["... broad responsibility ..."? According to who?]
... The social justice initiatives of the Federation focus on poverty, child and youth issues, race relations, gender equity, homophobia and heterosexism, bullying, environmental issues, globalization, and violence prevention. In addition, the Federation has an advisory committee on Aboriginal education. [They haven't left out many of the social activists' favourite buzz words.]This can lead nowhere good. Parents - Rise Up!