I find it prevalent on both sides. I feel like you nailed me to a T with your self description. I've always considered myself socially liberal and fiscally conservative.  

I've equated it to the pendulum effect multiplied by sports team like fanaticism. 

It's funny because I've been called far-right Trumper and a libtard in the same discusison just because both seem to have gone so extreme over the last couple cycles. That topic? Financial responsibility and entitlements. I believe in entitlement programs provided we can afford them. Neither side seems to like that. 

All that being said, the media has gotten drastically worse during that same time period. While I don't watch TV media, I do read a lot so I typically will use AllSides.com to try to read an article from both vantage points.