I can understand what they mean...

The job I was originally employed to do stressed me out wayyy too much. 3 months and I was a mental and emotional mess and needed to quit. Experiencing psychotic symptoms which usually only happens under extreme duress.

Now I have a different function with stressful deadlines but it doesn't make me the least bit ill.

And it wasn't even the job itself, it wasn't too hard or too fast-paced, I enjoy hard and fast-paced. It was the working conditions, everything was logged and recorded, even toilet breaks. I felt like I was on Big Brother and was anxious ALL THE TIME!!!

So for me the amount of stress I can handle in the work place definitly is job specific