who said it was an obsession?
Some of the preference for one color over the other comes down to marketing, for instance over the years brown eggs have been marketed as more natural or more fresh by local producers who were competing with larger white egg producers.
So that message persists with many people, but even people that are “obsessed” with healthy food choices repeat a lot of misinformation that someone along the way has “sold” them on
Some of it is regional, some parts of the world use different breeds of chickens for egg production and that egg color is seen as “normal” while other places have a different “normal” or no “normal”
Speaking personally, my wife thinks the blue or green or pinkish eggs are pretty so that is what we have... but I find it makes the chore of collecting and cleaning the eggs a bit more interesting.
I have noticed that among non-chicken people that we’ve given eggs to, they generally don’t care one way or another about the color of the eggs... but many do seem more “obsessed” over the egg size... even with free eggs