Your critics are correct that you have failed in your attempt to read my mind. You should not have needed to, so let me be more clear.
Demographic shifts forced on an area by an unelected bureaucracy are almost guaranteed to be detrimental to the lifestyle the residents enjoyed prior to the shift. Whether that is gentrification pushing up property tax, low income housing pushing up crime rate, large influx of practitioners of non-tolerant religions who verbally and physically assault resident women dressed to western standards, or even large influx of young western professionals who don't respect the religion that was previously dominant in the area before.
Neighborhoods are a sum of their parts, and those who choose to live in them, choose them because they like them the way they are.
Overriding the wishes of those people to push your own agenda can be necessary for a city, perhaps, but should never be dismissive to the point of blaming and shaming the original residents to assuage your own guilt.
> A large influx of people into your area is almost guaranteed to [lead to] possible demographic shifts that marginalize your culture.
Gentrification sure sounds like an instance of that, and I've been hearing about techies pushing out hippies and artists for about as long as I've been old enough to pay attention. The fear of cultural change in SF is a constant enough thread in SF that a knee-jerk reaction that it's racial seems like an uncharitable reading.
This person is not describing gentrification, in fact, they're describing being avidly opposed to the opposite of gentrification.