The lack of US male teachers (as well as non-white teachers, especially at higher grade levels) is born out by the numbers: https://usafacts.org/articles/who-are-the-nations-teachers/

The share of male teachers has trended downward in the 80s and 90s (by ~ -1%/yr), then slowed in the 00s+ (to ~ -0.5%/yr), and now sits at 22.4%.

The share of white teachers sits at 80%+ for post-kindergarten grades.

So if teachers represent academic achievement, then there are certainly a lot of kids (especially male minorities) who don't see themselves in their teacher (ethnically and gender-wise).