Queer acceptance scales very closely with HDI with a 5-20 year lag. The actual causes I believe are poverty reduction, achieved higher education, urbanization, and most recently, internet access, which are all major HDI contributors.

(There's also a big contributing factor outside of HDI, which is queer legislation eg., sodomy laws, gay marriage, name/gender changing, surgery, hormone therapy. This more or less defines the boundaries of how much or little queer acceptance is allowed within a country for reasons I do not understand)

There's some capitalist tricknology embedded in HDI because of its use of nominal GDP/capita rather than GDP(PPP)/capita, but it's very widely used and good enough for this application.

By queer acceptance I'm talking about reduced hate crimes, and myriad trust-me-bro self-surveys, because it's a somewhat nebulous concept.

There are of course some very obvious outliers. Rich, extraction based countries (UAE, Bahrain) have a lower than expected rate of acceptance. Poor, tourism based countries (Thailand, Cuba) have much higher acceptance rates than expected.

There's also a very noticable East-West divide on which queers are accepted. Western nations strongly prefer cisgender homosexuals, and asian nations are conparatively more lenient when it comes to binary trans people.

The HDI-queer connection makes a lot of sense dialectically. The further advanced capitalism becomes in a nation, the more thouroughly the vestiges of feudalism are liquidated until a breaking point is reached where they can no longer justify the rigid gender norms that engender queerphobias.