I guess I would draw a clear distinction between aggression and sarcasm. I do believe you that it's a difficult task to make things function healthily at scale and I'm sure those involved in issuing recent guidelines were correct to do so. And of course I agree that we shouldn't be aggressive (though waveform apparently needs a reminder of this). But I'm pretty uncomfortable with eliminating sarcasm. That's really a very common mode of communication in some cultures. It feels very sterile/corporate to not be allowed to simply be sarcastic. Especially when the target of sarcasm is basically western hegemony, as it was here!
The guidelines don't rule out sarcasm. They ask for comments to be civil and substantive. The Venn diagram of those things may not have a lot of common area but there's definitely some. Just don't ask me to specify what it is—that's probably too hard.