Well there's a pretty clear difference between a tribes devoted to religion or atheism that annoy each other (for obvious reasons) and tribes devoted to hating a specific subset of people. It's not unintentionally annoying others that makes a tribe or a user toxic, it's about the purpose of the tribe or the motivation of the user. The purpose of /r/FPH was to demonize and hate a subset of people, and the motivation of its users was the same.