I think it's because they grew up in a leftist community where its was cool to make fun of the groups going under moral panics. Most of the moral panics came from some sort of lower / middle income religious right.

Now the moral panics are in the upper income left, and they actively try to get you fired if you trangress and all of a sudden it feels a bit restrictive in that environment.

Also social media makes average people significantly more vulnerable. Drunk comments would stay drunk environments outside of work comments, now drunk FB comments on a public group can get you fired.