As a society we like comparing ourselves to the norm, or the average. Not having that loose comparison actually seems to offkilter us all. Or is that the plan?
It does seem to be the queer theorists' plan. Queer theory seems to be about removing all societal norms. It seems to be important to the people pushing this to teach this to young children so that they don't grow up with an understanding of the societal norms of the society they're living in, but instead are fed the idea that those norms don't exist. This goes further than just heterosexuality, it's about everything which is socially acceptable (or not) in society.
The people pushing this seem unable to understand that what results from this is not more tolerance amongst those children but a lack of understanding about the world around them. Or maybe that's the plan? A generation of children who grow up lacking boundaries or an understanding of what is normal in social interactions. If they really want these children to build a new, more tolerant society, this isn't the way to do it.
More about what is going on in schools here, with some links to more information.
https://www.transgendertrend.com/no-outsiders-scheme-teaching-children-trans/