I don't think it's an indifference to microeconomics in particular so much as an indifference to anything that doesn't seem like it's especially relevant to one's life at the moment. People are indifferent to structuralist anthropology too, just to pick a random example. I agree that people are probably misinformed as to how useful microeconomics might be to their life though. It's a fantastically useful subject.

The reason macroeconomics is on the Khan Academy and has more general interest these days comes from the fact that people feel like their lives are in turmoil due to the economy, the real estate collapse, and Wall Street, and they don't understand how any of it works. Macroeconomics may be incomplete and perhaps even problematic, but it's the subject that can most shed a light on complex interconnected problems as opposed to local specific ones.