Polish is not the most sonorous language. We don't have many vowels, diphthongs, everything sounds boring and monotonous, at times, harsh etc. Never could sing any rock song, particularly progressive rock song in Polish. I'd say, it's a worst language ever on par with German. Hell, even German is better...
hhhjkg & others, You haven't then heard the "Warszawianka" sung. If you had, you wouldn't ignorantly bad mouth Polish. I've heard Rush Limbaugh, Donald Trump over many years, yet I don't speak ill of the American English language, do I?
Are all German speakers, singers, notable actors etc. speaking as Hitler spoke, for example? Your premise is silly!
What kind of crap is that "ignorantly"? People "ignorantly" bad-mouth things they don't know. We know Polish so cut it out with that "ignorantly" - a clever way to imply that you are not "ignorant".
If it was anyone more "neurotypical", I'd say it was simply a matter of someone who still believes (as many Poles do) that grammar is prescriptive rather than descriptive. In this case though, it's just plain mithering from a wazzock.
There's a lovely AmEng word that fits here: "ornery".