Earlier quoted context omitted.
To be fair, being ground up and having boiling water poured on you isn't completely unlike grad school.
Having worked on farms, with mechanics, and with grad students, I tend to believe grad students exaggerate their misery. While not always true, most grad students I know tend to have relatively good careers, which they are comparing grad school to. They also tend to be, relatively speaking, born into good fortune with finances and healthy families. This is not universally true, of course, but more often the case than…
The human experience is relative. If you're stronger than you were before you feel strong. If you're poorer than you were before you feel poor.
Manual labour jobs have about as much bearing on how a graduate student feels about their day to day as does a gazelle being eaten by a lion.