Um, are you sure it was meant as an insult? I've always heard that expression used to mean that someone wants to stay in their job as long as possible. I worked with a lady who didn't retire until she was 75, and she used to say that all the time from when she got to retirement age; whenever people would ask when she was retiring, she would say, 'Oh, they'll be carrying me out of here in a box!' So I would assume she meant that she expects you'll stay in that job long-term, rather than that it will kill you!