I guess people rely on ayu's music to drown their sorrow and insecurities within it? That actually never happened to me though. I can feel her songs but it's not like i use them for mindhealing, I just listen to them because I think they're cool and I enjoy them (I love her voice and the composition/arrangements of most of her songs). I guess I don't put much thoughts when i listen to music as I do it just for the sake of enjoying it, not to analyze if the singer is an opera singer, if the song is a cover, if they have vibratos, choir, the range of the song, how many octaves it has, whether the song is generic or random, pop or rock. I don't study music and I have no interest in doing it.
Maybe the sudden shift of her producing happier songs makes people egoistically think ayu is driving apart on a different way to enjoy her happiness and forget about them? I'm not guessing, it's just what I've seem from observations of comments of people who can't stand listening to "Beautiful day" just because they are always in a bad mood, and they feel they're being mocked while listening to the song.