Soooo, there's this whole ancient thread about how RMS disses on TCL in favor of guile.
I find it an illuminating basis for comparing RMS getting riled up about a tech thing almost totally outside the context of user freedom, almost completely about what we might call "code smell" programming aesthetics.
Don't know if you've seen it, and I don't know that I'd recommend it if you haven't. These sort of online brawls are a kind of acquired taste.