It is not a newish term nor is it an intended insult, it is a reference to those on the far left who are against free speech, the open exchange of opinions and ideas and who attempt to delegitimise all points of view but their own. There is much discussion of this in recent years. If you wish to inform yourself, simply type in regressive left on google or you tube. It is always good to do a wee bit of research.
I don't understand your second sentence at all. sorry.