The gay marriage movement was successful because same-sex marriage doesn't magically invalidate heterosexual marriage nor expect the majority to cater to us in some special way. Because of this, the average person came around, the US going from two-thirds opposed in 2004 to two-thirds in favor in 2014. Republicans, specifically, went from 19% (2004) to 55% (2021). Things like expecting anti-gay religious people to bake cakes or do photography for gay weddings have never gone over particularly well, especially with conservatives, because our sexuality was now impacting other people and their personal beliefs. This is why the trans movement is doing so poorly, they're aggressively campaigning for special privileges that impose their beliefs on everyone else instead of general acceptance and the public perception is only going to get worse if they don't back off.