I'm old enough to remember when what is now that great big alphabet of sexes and genders was just Ls and Gs, like in name of advocacy group PFLAG (Parents and Friends of Lesbians and Gays). Then the Bs got added, and then even more recently the Ts. And now as you can see above, there's even more stuff added. Maybe it'll keep growing until literally everyone on the face of the planet has some label from it affixed to them, so we can all stop being expected to keep up with this increasingly unwieldy initialism.
The fight for gay and lesbian recognition in mainstream society may go back quite some time, but to pretend like the recognition of LGBTQIP2SAA+ etc., etc. as a coalition for political and social reasons is something that is not extremely new is just disingenuous. I mean, I only turned 40 about six months ago, and everything I've described so far has occurred within my living memory. As recently as when I was in high school, DOMA was the law of the land (signed into law by the very liberal and, um, 'sex positive' Bill Clinton), and the idea that anyone anywhere would be performing 'gay marriages' for anything other than political reasons (which would not be taken seriously by anyone) in places like San Francisco or other gay hotspots was absolutely insane. And I say that as someone who grew up less than 100 miles outside of San Francisco and never had any kind of homophobia modelled in my little community. Heck, PFLAG came to my school in about 1993 or so to remind us (ages 11-12 or so) to not call things we don't like 'gay', or to use words like 'sissy' or 'girlyman' as insults (Hans and Franz from SNL were very popular back then...), and no parents protested or wrote angry letters to the local paper about the 'pro-gay agenda' of the local school or whatever. So I don't think it's in any way homophobic to recognize the reality of how things actually were, or that things have changed an incredible amount in a very short period of time (particularly since the height of the HIV-AIDS crisis in the 1990s; I think I would point to the mainstream popularity of films like Philadelphia and stories like the life story of Ryan White as doing a lot to change peoples' minds at that time about how they approached AIDS as a disease, and in the case of the film, gay people in particular).