> I later found out that this was apparently due to having been provided with a "teaching" version of the interpreter intended for beginning students (who presuably don't know any better), which makes it even worse.

I think you still misunderstand; racket doesn't have different interpreter/compiler versions with different language features, racket code explicitly can request different languages via a language directive (I think there is a corresponding UI option in the Dr. Racket UI.) Among the preinstalled options are a series of teaching languages designed to accompany the textbook How to Design Programs, among others.