I strongly disagree.
You can't have functional organizations where there aren't some common values about what's important and what isn't and where discussions, even about culture, aren't aggressively prioritized.
The greatest example I've seen is in grassroots organizations run by activists with "flat" organizations. Assemblies on everything, discussions about everything, rehashing and revisiting the same points over and over again, ridiculously petty feuds, incredible amounts of energy lost and just a handful of people actually doing the real work, because it turns out that everyone would rather fight their pet internal cause unless you have strong leadership that's willing to put a sock on it to actually _do_ things.
It's clear to me that the founders have extremely strong opinions about certain topics and that's where they put their energy for change and analysis and where discussions can be had with depth. Their values lie there, and for most other things they want things to run smoothly so they can focus on their most important values. It is extremely unlikely that a challenge to those values will go smoothly unless it is absolutely paramount in importance.
Would you go to work at Apple if you're a Free Software activist? Would you work at Exxon if you're a vegan environmentalist? At some point certain accomodations are not reasonable.
Some staff have basically encountered that, effectively, they don't share all of the values that management has. They can either: live with it, quit, or try to graciously let some air in the room to reraise the conversation with cooler heads and understanding that this just might not work out.
DHH's point on certain arguments making for toxic conversation are very, very real. I've seen it in several organizations. And strong leadership means sometimes drawing lines. What others do with said lines is up to each person.
Another political and NGO analogy that I have some familiarity with: if you're a third-wave progressive feminist militant, it is _extremely_ unlikely that you would allow TERFs (trans-exclusionary feminists, ie: people who consider trans women to not be "women") into your organization, because while they may consider themselves "feminist", their value system is just too different to get meaningful consensus on extremely important topics. That's just the way it is.