I think both extremes may have different reasons but the same outcome.
For the anti intellectualism on the left, it stems from real issues like the Henrietta Lacks and relation with race, and generally more that is talked about with critical race theory. Fwiw it is all important to address, but there is a strong contingent that generalizes it too far and will distrust all of medicine, science, education, and academic research.
I also know a lot of far left people who would refuse to vote for Bernie because he was white male