When did I say that?
Year or two back. Paraphrased, but reading between the lines you tend to jump to the defense of someone from "Anime-GAF" that has some

past history. I'm sure they're a good person, but they don't need to be defended.
Let's say you were a teenager when the Foo Fighters made their debut. You'd be 35-36. That's firmly dad rock status. Rage against the eternal march of time all you want, the reaper is going to get his regardless.
Even then, if you were like 8-10 or so when they debuted you'd be within 25-30 range. I wouldn't necessarily put them in "dad rock" since they aren't AC/DC or Rolling Stone "classic" level yet.