From what I see it's the dismissive way it was posed, with little curiosity about the real challenges. Similar to the 'oh I could build that in a weekend' style comments that are pretty exhausting for creators to have to deal with.
This submission is literally about why people aren't using some Rust framework. I add my two cents as to why that might be and then that gets called toxic and dismissive.
Seems like many people here aren't actually willing to engage in a discussion. I guess this submission is basically just native advertisement for the framework in question.