That might be, on the other side, I consider Lisp highly readable, but quite a few modern languages quite unreadable. For example parsing type signatures with a complex syntax.

Any style of writing you are not familiar with will require a lot of training. Try reading anything written in the Greek alphabet for example.

If you've not grown up accustomed to C-style syntax, I assure you that C is less readable. Even a for loop is crazy in C.