There's a time/place for encouragement, and a time/place for criticism. I've only found a few comments in this thread that are even remotely derogatory or toxic. There's nothing toxic about blunt, honest, criticism. HN is known for this type of feedback anyways. It might be abrasive and tough to swallow but it's not toxic to tell someone their product needs work in a community that is arguably known for and built for just that kind of feedback. Not to mention that the folks bringing up issues with the product are providing detailed reasoning for their critiques and solutions.

TL;DR Blunt, honest feedback != toxicity