I didn't read it as a "personal insult".
It's true that most software engineers never work on safety-critical systems. The nature of the products they work on, or the nature of their contributions to those products, limits the possible impact of flaws and mistakes.
Once you work on a product with safety-critical features and/or become responsible for one, there really is a marked psychological change that takes place. I've lived through that change in my own career, and many comments (including some I've written, I'm sure) now strike me as callous and trivializing important matters to an extent that grates.
It's important to hold engineers accountable for their work in proportion to their impact, which is typically very significant. If you build machines that can kill, stakes should exist for you as well.