The water in some parts of the US has natural chemistry that makes it unpleasant to drink even though it is safe. California urban areas are notorious for this, as an example. In principle you could remediate the water to make it taste good and remove any discoloration (also a thing in a few regions) with enough industrial processing but that would greatly increase the cost of already expensive tap water.
People who grew up in one of these areas are habituated into never drinking the tap water even if they move to a city with excellent tasting and very high quality tap water. I’ve lived in extreme examples of both.
You also see the opposite case, where someone who grew up with amazing tap water naively grabs a glass from the tap in north San Diego and has a “wtf is this” moment.
San Diego's tap water tastes truly awful. The first time I ever traveled to another city (Denver), I was forced to drink the tap water and could not believe how good it tasted.
One aspect of college is that it's supposed to teach you how to be a better thinker. One could make the argument that someone who graduated through college should have developed the critical thinking skills required to teach themselves another skill that IS in demand.
What do you tell new grads who can't find a job to do? Learn plumbing, heating/AC, or electrical work? Start a small business?
The whole point of college is to get a desk job and to avoid manual labor.
Plumbers have to literally scoop poop out with their hands once in a while.