Pewnie tak, ale ja bym tak nie powiedział, szczególnie opierdzialając jakiegoś kolesia który mnie wku...
But you said...
The words "Polszczyzna, Angielszczyzna" could be used in a book on literature, poetry or in some country culture class, but not in an argument between some ordinary people I think.
... like it was not possible to say that anywhere outside literature, poetry and country culture class. I just prove you wrong.
Also I hear Polszczyzna being used quite often in day-to-day speech among my friends and colleagues. Angielszczyzna is indeed quite rare to hear.(still correct and nothing odd though)