Physics majors, in my experience, had a significantly higher arrogance level.
It’s just different leagues of intelligence: social studies undergrad vs math undergrad vs math grad vs competitive researcher.
EDIT: Uh, actually, it looks like I may have underestimated myself at basically every point here and would have become a basically okay mathematician based on updated priors.
For what it's worth, my classmates from college who have completed PhDs, based their postgrad career decisions on completely different factors – mostly their families and partners, and whether they're willing to move around (especially to rural areas) to target an extremely shrinking academic job pool.
EDIT: example that came to mind – I had a classmate who postdoc'd at Chicago, who decided to stay in town and work in finance rather than pursue some tenure-track offers at R1s, because his young one went to a prestigious UChicago Lab School and didn't want to uproot her.
So yes, they are teachers or administrators or make minor research contributions.
The smartest ones were usually the philosophy majors. Also some of the weirdest (in a good way) folks.