Yeah, Dave gets annoyed when too many people think a song is a bout Kurt or Courtney or whoever. That article that ranked the Foo Fighters songs said that "I'll Stick Around" was about Courtney Love and I'd honestly never thought about that, so I feel like in a lot of his songs it's just as easy to throw that backstory onto it as it is to not see it as all. I never really thought "My Hero" was about Kurt either, but again, it kinda makes sense.
The only song I know that's actually kind of for sure "about" Nirvana is "I Should Have Known" because Dave talks about it in Back and Forth and how that song is kind of about moving on from that era and whatnot. But even then Dave doesn't write lyrics that are all that direct so it could apply to a lot more. Which is really what a good song does.
And I think my verdict on Sonic Highways is pretty much in line with everyone else's. It's not as good as Wasting Light and kinda goes back to a more standard Foo Fighters sound which is kinda disappointing. Like think about when Rope came out ahead of Wasting Light and it was like "Wow, this is different for them, but awesome." I didn't get that "different" vibe from Sonic Highways. Ever since adding Pat and knowing his influences I kinda hoped that there'd always be a "White Limo" ish type song that wasn't afraid to get punky. And that's kinda my thing with this album. At this point, with all the people he knows, all the people he's played with, Dave shouldn't be afraid to lose the Foo Fighters sound somewhat. It's gonna be there no matter what, and it'd actually be cool to see the genre blending Dave does with his documentaries and other projects come through on a Foo Fighters album. Maybe that's just me.