Do you have any actual EVIDENCE for ANY of that.  Because I don't see ANY of it.  Take a look at all the media comments sections.  They are FILLED with vitriol at 'liberals/left/progressives'.   I see very little going the other way, in fact most media has gone out of its way to understand, say, Trump's win.  And while I read LOTS of namecalling of 'liberals/left/progressives', even in cases of disagreement there is little of that insulting commenting going the other way.  At the Post I get a frequent critic who starts off with "stupid comment".  Many of these people can't even disagree civilly. 

      And I disagree with your first part, because I think these groups ARE influential.  In Austria it looks like they might elect the first far right party since the second world war.  And comparing political parties to a couple of random samples from colleges dont even compare.