The past 100 plus years have been a time of social activism, a time of gaining civil rights for anyone who is not a male, white, property owner.
First, the black slaves were freed. At least technically.
Next to fight were women, beginning in the late 19th century. It took about 30 years of fighting, marches, protests, jailtime, beatings, just to get women the vote. And women are still not equal to men.
Next was the 1960s, a time of marches, protests, cross burnings, lynchings, and riots to gain power for people of color. And now they are still prevented from voting, are more likely to be shot by cops, held at the border, separated from their families, live in poverty, etc.
Next the gays. Since many are white males, it was sometimes a bit easier than for women and people of color, especially if they had money. But it's been ugly, people are still murdered and beaten daily, socially ostracized, etc. Same sex marriage was finally made legal, after a lot of struggle and activism on all fronts.
(There are also ongoing fights for legal recreational cannabis, which is another huge issue.)
Now it's time for fighting for civil rights for transpeople, other queers, and for polyamorous relationships to become socially acceptable. It's going to take a lot more than just arguing on social media, YouTube, reddit, Twitter. It takes real life activism, which you, edpsy, seem to find very intimidating. You won't even come out to your parents, much less march in a Pride parade with the poly contingent, or protest outside a city hall, anything out there away from your keyboard. Maybe you will eventually.
Yes, it takes being "out" to get things done. A few movie and TV celebrities are out as poly. They are mocked, and misunderstood. But poly is more and more in the media. Check our own media section here. There's a good new article about a poly community, in Brooklyn NY, where the members don't even consider themselves pioneers, but think they are the settlers, the 2nd wave of polyamorists.
As I've said before, ad infinitum, ad nauseum, prejudice against people of color, against women, against queers, against women having multiple partners, has been in place for about (at least) 3200 years. It will take many people of the newest generation, working very hard, to keep bringing change and equality for people who have been enslaved for so long.