Inequality between countries is decreasing. Poor countries get richer and wealthy countries lose some but less than the poor gain. That is positive sum.
For example you might lose 10% of your salary but four people in India double their salary. It's a slow process so it will feel like the downward trend will go on forever but one day it will change its course and salaries will go up again.
Inequality within countries is increasing, and is more directly connected to experienced disutility (though media saturation from one country to another can also make inequality b/w coubtries a factor in experienced disutility.)
A problem with naive economic analysis is that it tends to pretend that absolute material wealth is the prime determinant of experienced utility (and consequently that disutility is mostly driven by absolute deprivation), which while true in the most abject poverty isn't true beyond that level.
I would imagine American workers interpreting decrease in their quality of life and their wealth as a negative event. Condoling the fact by pointing out that some folks in India are now much better off is tone deaf at best.
For example you might lose 10% of your salary but four people in India double their salary. It's a slow process so it will feel like the downward trend will go on forever but one day it will change its course and salaries will go up again.