This is precisely what it is. They're teachers, for crying out loud.
The US hasn't really done 'giant tower block' public housing for decades. That's just scare tactics.
https://www.sightline.org/2018/05/25/a-century-of-exclusion-...
Of course, in places like San Francisco and Portland, people are mostly smart enough to not "say the quiet part out loud", so they come up with other excuses.
No we fucking said the quiet part out loud quite proudly in San Francisco. Take a look at the covenants in the Forest Hill neighborhood. It's still fairly bad as those folks recently successfully fought an attempt at building a low income retirement home.
And we certainly weren't that offended by the Chinese Exclusion Act.
https://www.fastcompany.com/90242388/the-bad-design-that-cre...
[1] I could see criticizing public housing being code for "we don't want anyone who isn't upper middle class"; which of course is unreasonable. However, on the other hand I've lived in places where the public housing took the form of a massive tower block that was like something out of Judge Dredd; so I think its understandable that people would be concerned about it if they aren't given any assurances.