Turning off Twitter and Facebook are quite easy to do, apart from their addictive designs. (I permanently disconnected from Facebook two years ago, and today only occasionally check Twitter a few times a month.) There are a few things I miss out on not being on Facebook (mostly some groups that would be helpful for my actual, real-life networks); I miss absolutely nothing by being off of Twitter (and HN is like a quality filter for the tech industry Twitter crap).
So, indeed, even if someone could define an objective criteria for "hate speech," everyone is still offended by their own consent.