- To single out the lyrics of a song means they matter to your liking of a song.
- To single out the lyrics of one song from a band you claim to like DOES imply that those lyrics are exceptional compared to other songs. Else, presumably you wouldn't like the other songs and thus wouldn't like the band.
- It's fair to assume that all or most of the rest of the lyrics in the catalogue are NOT singled out, and are therefore NOT bad.
And I'm saying that's not necessarily true for others. Forget Shakespeare (you're being pedantic on that point; it's symbolism and I think you know that), but I don't think the lyrics of JLMB are any more or less juvenile, surface-level, or unsubtle than many of the other songs in the catalogue. So if that's enough to ruin JLMB, it's hard to reconcile why more songs aren't equally ruined.
The part I highlighted is where opinion comes into it. Your subjective evaluation of JLMB doesn't play into the opinion of "IDontNotDoThings," When IDNDT says that the lyrics of JLMB "are the most surface-level critiques of the music industry that an angry teenager could write in 5 minutes, & have the subtlety of a brick," that opinion does not take into account
your opinion that "the lyrics of JLMB are any more or less juvenile, surface-level, or unsubtle than many of the other songs in the catalogue." Since IDNDT may have completely different opinions about the relative merits of JLMB's lyrics and the lyrics of other songs, it's not at all "hard to reconcile why more songs aren't equally ruined." Moreover, who says other "songs aren't equally ruined"? Maybe, for IDNDT, they are. However, JLMB was the only song under discussion, which gets back to my original point....
I completely disagree with your second bullet point above: "To single out the lyrics of one song from a band you claim to like DOES imply that those lyrics are exceptional compared to other songs." No it doesn't -- especially when one particular song is being discussed. Maybe we're having a discussion about about the Los Angeles Rams, and someone says, "Jared Goff" is terrible. That statement implies nothing about any other quarterback, so it would not be appropriate to respond by saying, "well, yeah, but it's not like Josh Rosen is the second coming of Joe Montana." While it may be true, the person commenting on Jared Goff is not implying anything about any other quarterback.
And, just to be clear, what I'm quibbling with is the assertion that IDNDT's expression of an opinion about JLMB's lyrics necessarily implies that the lyrics of other DT songs are exceptionally good (or whatever you hyperbolically meant by the Shakespeare analogy).