The idea that someone should just "learn to code" shows a huge lack of understanding of what "learning to code" entails. It also doesn't help that they'll need to earn a living while they're learning to code, and that they'll have to move from a dying town to find a job where they can code.
They weren't offended by the idea of learning to code. They were offended by the dismissive nature of the major life change that switching careers and moving to a different state entails.
And, as someone who learned how to code, I'm offended by the dismissive nature of the technology industry as just "learn to code."