I read a thread yesterday talking about this and the general consensus was that "No, you can't, you should've muted"
Well, I've learned otherwise. http://prntscr.com/nhp31h
Kinda mad... but I completely deserve this.
A 3 day ban is a manual review, so its likely someone bitched about it in a support ticket. The automated system isn't going to punish you for it.
Hey all, Player Support here. Generally it is not our policy to ban players for spoilers, and we'll be looking into it.