for the Vtuber specific thing it's just a sentiment I've seen often enough not being expressed as a general celeb dislike, but just seeing JP fans seeing Holos collab with something they like and seeing comments "why are V here......." that don't seem to just be generally fatigued by celeb shit, but specifically that the "new thing" vtubers are coming in. Seen it in anime and game tie ups in the past, saw it in stuff like Mori collabing with Zutomayo (who to this day remains the only person Zutomayo has ever collabed with) so just kind of acknowledging that Japan has it's own sort of entertainment-luddites scowling at the new big thing.