Biased media has always been a thing, but giving every dumbass a megaphone (and making money off it, spending some to create even more megaphones) is a very new thing and we're now seeing the effects of it on society.
You could say that it's inevitable and that if it wasn't for social media then forums would fill the niche, and while that's true, those forums would be something you'd explicitly need to seek out if you were already interested in this kind of content, where as right now the same thing you used to keep in touch with your family harbors this disgusting content and might even show it to you if it thinks there's a probability you'll "engage" with it.