When I have edited people's writing, at times I have been too scathing and when I was in my twenties, a few writers even called me abusive. When I am stressed out and faced with what I consider incompetence, I don't always do a good job of controlling what I will write. I have deeply insulted people in my time, including people who were doing things for me for free. Heck, go through my comment history. A few days ago, I was so scathing on a Show HN that I am scared I actually destroyed an entrepreneur's confidence.
I'm only sharing this because I'm not particularly qualified to answer this question. Personally, I don't find LT all that bad, but that might be because at various points, I have been worse.
Had situations been reversed a decade ago, I would have been much more difficult for Hypatia to deal with than she was for me. Again, she was reasonable, she was 100% correct, and she had cause to roast me and the company I worked for over the coals. Despite this, she was kind and helpful. Heck, my boss yelled at me every time she emailed me, yet I have enjoyed and learned from every single interaction I have ever had with her.
In light of how she behaved in contrast with how I would have, I trust that she is better qualified to make statements like this. Not only is she more talented than I am, but she is far better at communicating through difficult times than I am. It is unfortunate that Twitter confines you to 140 character bursts because 140 does not give much space to be constructive. I hope we get to hear how Hypatia would change that document because personally, I would learn from that.