15 minute cities do exist, just not in the US. Admittedly, the concept doesn’t always work for work related commutes, because some businesses just need lots of infrastructure away from residential areas. But there are plenty of cities where grocery stores, gyms, restaurants, doctors etc. are within biking or walking distance.
White people tacos refers to a specific way of making tacos, which has little to do with any Mexican recipe. It’s named that way because it’s usually eaten by white people.