Specifically, $100,000 is about 80th percentile income in the US.
About a third of American households make 100k a year. Median household is about 70k a year:
But I suspect the person making the claim was just picking an arbitrary number where most people in that salary band will have decent benefits, and can usually afford the out of pocket portion also
I think you're reading too much into the OP's off-hand guesstimate. At every company I've worked for, the engineers earning $200K are on the same health insurance as the high school graduate in the warehouse earning $40K/year. The higher compensation makes it easier to clear the deductible/out of pocket maximum hurdles, obviously, but there wasn't a secret insurance plan that got unlocked at higher compensation.