It's not just a fart joke though, that line means that someone actually farted and then made a joke about it, in a public workplace. So let's call it like it is.
Granted, I don't think farting and laughing constitutes as a hostile work environment, it's just stupid, uncouth behavior. The lawyers should have done a better job at pruning the actual written lawsuit so it looks more reasonable.
The other part of the lawsuit that I think doesn't help is where it states that the plantiffs were required to play the game online, where they ended up getting harassed by other players outside of the company. Like, you work for an internet game company. It's not an absurd notion that you should be required to play and understand the product you help produce. And furthermore, the actions of people outside of the company have no business being used in conjunction with the lawsuit. That's just people on the internet, and that's the risk of using the internet. I consider encountering bad people online as part of the grind, and if it's that bad and you have to potentially experience it daily, mute everyone and be done with it.
Overall, there are strong points in this lawsuit, but it's peppered with some things that I think drag it down. I think it needed more revisions before becoming public.