It’s amazing how people are reading this to say the opposite of what it says. The end of the essay literally tells the reader they can appreciate Lisp if they just take the time to understand it, and they should make the effort. Not “if you don’t already know this, you must be stupid.”

If someone writes code based on an algorithm out of a 1985 textbook, and I tell them that they could make it go 20X faster if they learned more about processor architecture (out-of-order execution, cache coherency, NUMA, etc.) — a new dimension of programming to them — am I making an ad hominem attack?

Once I made somebody’s SQL query 100X faster by explaining what an index was. Fortunately they didn’t think I was attacking their intelligence.