It is actually making me wonder if the reason we don't see more civil unrest (i.e. around Brexit) is because so much aggression is displaced online. Bit of a weak thesis maybe.
Well to the extent that there has been any civil unrest, or at least extremely angry and borderline violent protest, it's been carried out by people who are *pro* Brexit. (And not just borderline, when you consider Joe Cox.) The 'grab what you can and burn down the rest' wing of the ruling class has done such a good job of portraying the 'grey technocratic business-as-usual' wing of the ruling class as the true elite, and of itself as the vanguard of 'the people', that this is where angry prole energy is being expended these days.
And yeah, there's plenty of anger on the other side but it's mostly in people who are a bit too nice and middle-class and who go in for witty banners rather than smashing shit up. Then among people who are genuinely radical you've got a dwindling but still loud minority of twits who still think 'Lexit' is a thing, and a probably much bigger contingent who are now firmly anti-Brexit but who are reluctant to come out in force for fear of being seen as anti-Corbyn, as pro-EU per se (Neoliberalism! Fortress Europe! Soros!) or as being on the same side as Tony Blair and the Lib Dems.