What is toxic positivity?
It is the other side of toxic negativity. It is loving a piece of media so much, that you go to lengths defending it that are harmful to others or to yourself. So no just disagreeing with someone who criticizes a movie you like, but attacking their character, harassing them, painting critics with a broad brush, declaring them some kind of awful thing, even if all they've done is say they don't like it for a reasonable reason. I think like toxic negativity it also can get into dehumanizing and dismissive language and treatment of people perceived to on the other side. In its milder forms I would say it is simply an inability to tolerate criticism of something you like.
I think the boogie man of review bombing is a part of this. I am sure some people review bomb, but I am equally sure there are people review bombign both in favor and against a movie or show. We don't really know how extensive this is. Online platforms are pretty imperfect and not good at measuring how many people like a thing because there are bots, there are trolls, there are badly designed systems that misread review ratings, etc. But lately I see any wave of audience criticism just dismissed as review bombing, even if the show or movie in questions turns out to perform poorly at the box office in the end. Eventually with time we get a clearer image of these things anyways. And sometimes the fixes for this can be worse than the problem. The Rotten Tomatoes change for example, where they only measure audience scores by people who bought tickets through fandango is going to miss all the people who didn't purchase tickets in this way. In the end, we are probably just better off taking all review aggregate ratings, and frankly all reviews, with a grain of salt
No one sends rape threats to actresses they like. At least I really really hope not.
It isn't about them targeting the actors and actresses they like, it is about them targeting critics and people online they don't agree with (and threats do emerge from this as well). Obviously fans do stalk celebrities as well and that is a problem, but that isn't the kind of thing I am talking about with toxic positivity