These mental health care workers need humor as a release from the stress of taking care of those with whom society cannot be be bothered. Actually, these are funny because there is a strong element of truth in them.
I respectfully suggest that you lighten up. You may think that being "outraged" by this makes you a better person, but it really only points out that you are humorless and sad little black hole in society.
How did you find outrage and humorlessness in my little comments? I'm just sick of a culture that thinks humor should involve crassness and deliberate insensitivity, that's all.
A certain level of manners is a sign of civilization. Perhaps you would see this objection more clearly if one of these songs were "Billy the Retarded Elf."