Why are kids shows obsessed with being disgusting?
Because Gross-out humor is oh so funni.
The only good gross out humor is in Ren and Stimpy, and plenty of old Nicktoons.
What's more prevalent nowadays is shows that amount to little more than NOISE NOISE NOISE. See "Fanboy and Chum Chum", "Annoying Orange", or a vast majority of Modern Nicktoons for examples.
Hell the only thing Nicktoons (The Channel) is any good for anymore is Reruns of good shows, [parasitic bomb], if I ever have kids (HA!) I'm making them grow up with what I grew up with, the mid-late 90's and early 2000's of TV. That means old Nicktoons, Cartoon Cartoons, DCAU, Power Rangers, and lots of Boomerang.
Because no kid should have to watch a show that eliminates the need for an attention span, that's just wrong.