The joke is that the person making the image hasn't watched the Disney channel since probably around 2003 or so and as such does not recognize any of the many successful shows that have since aired on that network. Two of those in the image have given rise to incredibly popular pop singers who I would imagine the person also deems as "garbage" and "not real music."
I guess the real joke here, the one that is deeper than just the "these shows aren't the Disney of my youth" one, is that the person has effectively become like their parents, or older cousins, who thought that Even Stevens and Kim Possible and N*Sync and the Britney Spears were all just garbage and not a product of the real Disney.