Another way to put it is that, in here, people can have a bit more critical opinions, as for the the type of forum this is, people can comment on games without actually having supported the Creator of the game (also meaning no Buyer's remorse or Sunk Cost Fallacy involved). It's actually not always toxic, and it does depend on a game-to-game basis. Generally speaking, games where developers are active within this Forum fare a bit better (as the Community contact is also better in that way). Also, newer games generally start out relatively neutral in opinion from users. The opinions only start taking shape in time, given the game's evolution. Therefore, a game that usually misses deadlines or has poor community connection will end up breeding a more toxical atmosphere here (even while the Discord for said game can be a bit more positive, as there, people who actually supported the Project take longer to be critical, as they have already sunk some money into it).
Of course, this to refer to the more Objective opinions, not the jokes. Jokes can always vary (although they, too, generally follow the Thread's general atmosphere).