Nothing happened to them it is just a manifestation of their inner being. They are losing all relevance and are trying to hold on any way they can.
I have a dear friend who was kind of a mainstream Democrat, up until about a year ago.
But since then, she's gotten progressively (no pun intended) nuttier and nuttier, to the point now where she puts up five to seven posts a day on Facebook with online signature initiatives, all kinds of "articles" from every progressive group on the planet, on and on.
A few months ago I offered up a little resistance to one of them and she went crazy. Since then I just leave her be.
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I know a few people like that. Most of my liberal friends have been fairly quiet lately. I suspect that the left got too crazy for them so they don't talk politics but a few of my FB friends have marched right off crazy cliff with the radical leftists. One keeps calling for "Democratic Socialism" and bashes Trump at every turn. Yea, anyone who questions the posts gets their head bit off. I am tempted to say something about Venezuela just so she unfriends me.
Some just look for something to be offended by every day. The same ones suffering from Trump derangement syndrome are the same ones repeating the daily talking points. Some radical leftist incoming congress pukes are promising to investigate Trump until they find a reason to impeach him. Sad part is that their supporters cheer this total waste of time and money.
Anything that is not completely in lockstep with their agenda is attacked and they are desperately searching for anything to criticize. Lately, it's been an attack on the song, "Baby, It's Cold Outside", and even picking on Rudolph and other Christmas movies. Of course, they are picking on Christmas/Christians in general. A couple Muslim congress woman just picked on Pence for being a Christian. Can you imagine if that were in reverse? Someone's head would be on a platter- literally.
Of course, they find a reason to lose their shit every day. Apparently, just being alive is all they need to be offended every second of every day. Just when you think it can't get worse, they fall apart over the tiniest thing. You really have to stretch your imagination just to try and see how they managed to be offended. They have learned how to turn virtually everything into a scandal, conspiracy theory or other offense. No one or nothing is safe from their mental illness.