While cast members on Big Brother spend most of their time annoying viewers, one idiot in particular has irked more people than usual by referring to people with autism as "retards."

Celebrity gossipsite TMZ has obtained a letter from John Gilmore, Executive Director of Autism United, to Viacom bigwig Sumner Redstone and CBS, demanding that they take action after a segment aired on Wednesday's show featuring Adam Jasinski making the stupid remark.

Check it out now:

[youtube]http://www.youtube.com/watch?v=GNwuXRY8X7E&eurl=http://www.tvfanatic.com/videos/adam-jasinski/[/youtube]

According to the letter, Gilmore claims CBS made a "conscious choice" in running the quote - and used it for "their own personal goals." It would be hard to argue with that.

The organization calls for "[Big Brother 9] to be canceled, and expects an apology to people with autism. Gilmore also tells TMZ they've contacted the show's advertisers.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.