I used to participate in a forum that was easily 50% trolls by volume and actively encouraged insulting language, and I think I got a more nuanced understanding of politics there than anywhere else in my life. There was a willingness to really delve in to minutia ("So you'd support abortion under X circumstances, but not Y?" "Yes, because of Z!"), which helped. Oddly, though, the active discouragement of civility meant that a normally "heated" debate felt the same as any other conversation there, and it was thus very easy not to feel personally invested in signaling and social standing (and anyone that did try to posture overly much would just be trolled in to oblivion...)