I don't find the conversation to be especially disrespectful. The people in the thread in question attempted to shame him, to some extent. Shame is a social measure to coerce people who are behaving contrary to society's expectations to change their behaviour. However, while shaming him, they did not especially resort to childish name-calling or ad hominem. They reasoned with him extensively as to why his behaviour was deeply undesirable. He went so far as confessing that he did not even know the language of the PR he submitted, yet intentionally withheld information about the provenance of the code. Sometimes the shame mechanism is misused for things that should not be shamed, but this seems like a clear case of shameful behaviour that deserves social repercussion.
Sadly, it seems like nothing was learned, since he settles only for diminishing his culpability in anti-social behaviour. He goes so far as to describe, in his blog post, his code as an "AI-assisted patch". When you profess that you don't even know the language of the code that the LLM generated, there is no "assistance" about it, you're at the deepest end of vibe coding. And in submitting it to an open-source project, you're making a maintainer spend more time and effort reviewing it than you did prompting it, which is not sustainable. Moreover, if the maintainer wanted a pure-LLM-generated solution, there was nothing stopping them from hopping over and typing in a prompt themselves.
In fact, most of the comments were purely a debate with no direct attacks at all. The extent of "not respectful comments" I see are something like...
So your original comment that you "didn't want to hype up AI" was a lie, you really just wanted to pretend it was your own work and didn't want the project to be able to make a choice about it. There are good reasons why projects may not want to accept code generated by AI. They may not care. But by consciously choosing not to disclose that, you took that choice away from the project. That's pretty lousy behavior if you ask me.
"Pretty lousy behaviour if you ask me" is incredibly tame. If that's what counts for toxicity, then you're advocating for a toxicly positive carebear forum where nobody is allowed to criticise anybody else's decisions.