Im not sure that its happened because of bonkers ideology seeping out of universities. I think that explain some of the acceptance among the university educated. But i dont think it explains how the laws were introduced before anyone was talking about it.
It wasn't the acceptance but the fact that young inexperience students just bought into what they were told. And by virtue of being educated these people were more likely to be the ones that then moved into positions of power and influence eg politics and the media eg the editor of the Guardian saying "queer politics influences everything I do".
Added to which, and I cant find the threadson this, but some have been mentioned up thread, running parallel to this were groups who effectively lobbied, and in most instances, not for people with genuine gender dysphoria, but to use that to be a platform to argue for this concept of personal choice.
Most laws are introduced for issues most of us aren't aware of, but there probably aren't that many that were introduced primarily because a small group so effectively lobbied for their view point. And because most of this lobbying was going on behind closed doors, those who would be impacted on, ie women, were not there to provide another viewpoint.
And obviously introducing a trans character into a popular soap wasn't because audiences were clamouring for it, was because a product of the queer grooming was able to use a position of influence to propogate their view point.
And back in the 80s, let me tell you many many women, especially those who were teaching or attending women's studies were only too aware that this was part of the male back lash against women's liberation. What I think most feminists at that time never thought that the more academic concept of gender rather than sex in a teaching environment, would then become a lived reality for some people. In the 80s the very tiny trans community were in fact more associated with the (cant use the p word) but those arguing that sex between adults and children is okay.
In fact Stonewall was quite late to the development, but as said up thread, not being as relevant as a campaign they once were, they opportunistically added the T without anyone being consulted as to whether self identifying as a "gender" had anything to do with people who are same sex attracted.
But in fact, whether intentional or not, Stonewall adopting the trans agenda gave trans issues a credibility it hadn't previously had, because of the credibility of the campaign for gay and lesbian rights. So many people just sort of went, oh well if it is part of that we should support, not knowing that the trajectory was to use trans rights to undermine women's (sex based) rights.