The way I see it, Disney has built a company that provides quality entertainment in several venues including parks, film and television. At the same time they underwrite provocative R-rated films like Kill Bill, they also continue to produce quality childrens entertainment like the Veggie Tales and animated features.
Smartly, they have figured out how to bifurcate their content and cater to both children and adults simultaneously.
Should a smart company deliberately shun a large potential audience?
Beyond those practical realities, I think a lot of people here are forgetting that children can see the same T-shirt as an adult and it will not register with them that it has a sexual connotation. Children are not sexual beings, have to frame of reference to sexual matters, and do not "get" sexual humor. Ever watch cartoons like The Simpsons or Animaniacs? They may be cartoons and maybe children watch them, but they're filled with references that only adults would pick up on.
Disney is a smart company. People of all ages, races, beliefs, and sexual orientations enjoy their product. Other than whatever mental anguish you allow yourself to suffer, this isn't harming you.
"Veggie Tales" IS NOT DISNEY.
If I'm wrong I welcome correction.