His analogy is that some people want to know exactly how their car works, but most people just want to drive. I don't think that's an attack on everybody who's not an automotive engineer.

Also, he is flawed when saying that only about 1 person out of 50 should like this book ... since the largest part of the people exposed to SICP are programmers

He acknowledges that by saying "a big part of the explanation is that the audience is self-selected." But he also seems to be acknowledging that not every programmer needs or wants the depth that SICP provides.