Edgy is a word whose meaning has greatly changed over time. Back in the '60s-early '80s, "edgy" referred to talented satirists
like George Carlin who took well-deserved potshots at a notoriously
conservative, straight-laced, and repressive establishment who had strict rules about what you could and couldn't say on broadcast. Nowadays, since people
like Carlin basically won that battle a long time ago, and it's
normal to hear people talking about vibrators on Oprah, "edgy" refers to people who just say outrageous things for shock value, or take knee-jerk, reflexive anti-authority/anti-status-quo stances without carefully thinking over the ramifications of what they're advocating.
I spent 10 minutes on Reddit, and in those 10 minutes, I learned from some
14-year-olds that the Holocaust is hilarious, that all fat people are
lazy pieces of
shit, and that the reasonable solution to environmental pollution is to ban all cars. How very, very edgy.