Considering it as “too stupid” is kind of delightfully ironic.

To answer your question, no.

I posit that any person you’d imagine to be “too stupid to be depressed” is by another measure smarter than any depressed person on a degree of how to use their mental bandwidth.

Ignorance is bliss I suppose.

Depends on if you define “stupid” as being “unintelligent” but in my personal life I’ve noticed a bellcurve where the people most optimistic about life to be the dumbest and the smartest.

Instead of my take on it, here’s an interesting study on the correlation

https://engl105sp2020.web.unc.edu/2020/02/is-there-a-link-between-intelligence-and-depression/