What toxic postivity is? Cult-like spamming of "EW was great!" in a discussion thread. Being sheepingly positive. You can also see this in the game. Say anything beside "o/" or "gg" and you risk getting kicked out of a group. I once dared to complain about someone spamming chat with their macro - kicked. Hiding your true feelings and possible useful comments because only positivity is allowed is toxic. Smile and hide it inside. Welcome to the new world. You don't need to be happy but you have to look like it.
Of course there is stuff to be happy about. Even in EW. A lot of people like the story. Problem is they played through it when EW released. Lately there is a lot of waiting between content and features like Island Sanctuary and Criterion & Variant Dungeons or the new Deep Dungeon, all of which most seem to dislike. A big story cliffhanger for 7.0 in 6.5 could spawn quite a few positive topics on the forums.
Are some of the lore discussions not positive? Or is it only positive if it praises the game in every sentence? When is it negative? If it doesn't do that?