> What was progressive yesterday becomes conservative today - think of women's rights, interracial marriage, etc. The same goes for 'who' was progressive.
That's really not what's been happening here, though, and the extremely online activists are not simply people who are ahead of the curve on pushing to fix society's flaws. For example, take trans rights, the main weapon currently used to demand people get in line - in reality it was the boring, normie mainstream liberals who dragged the online activists into supporting that in the first place, not the other way around. Until just a few years ago they supported anti-trans viewpoints that were way out of kilter with mainstream society and demanded trans women shut up about harassment campaigns that went just as much against mainstream norms and values as the harassment that the online left is apologists for today. There's a good chance this changed through younger people with different views coming in, but they had those views in the first place because society as a whole had already shifted.
The difference really, genuinely, and consistently is just toxicity, extremism, and a refusal to accept that anyone who deviates even an inch from their views is a decent person. Those are the things that have stayed constant even as the arguments and the targets have shifted. The culture shifts easily from expecting trans women to shut up about TERF harassment campaigns to justifying harassment of streamers who play a game based on a franchise by someone who liked tweets containing TERF views because the cruelty is the point. While the views go beyond what mainstream society is willing to accept, the direction is extremely questionable. (For example, there have been multiple ugly Mastodon disputes involving server operators trying to shut people up about the long trail of rape allegations that follow one specific trans woman around, pretty much all from other trans women. Paying attention to them is supposedly hateful and an attack on trans women. Again, this is one specific person who's allegedly doing it, the same one every single time - not trans women as a whole.)