The political climate in the UK is pretty savage right now, Brexit pretty much split the country in two. I don’t think this is just a US phenomenon, especially given a lot of what happens in US politics bleeds into the rest of the world (which is why a lot of us follow it so closely).
...or, did tabloid-style "journalism" bleed from the UK to the US as they both reach new heights in fear-mongering and blaming the out-group to get rage-clicks as news organizations' incomes decline?