I think Eric Cartman is mentally retarded. Don't you agree?
You're being rude using that word. Do you really know who Eric Cartman is?
Cartman is a mentally retarded boy from South Park. In fact I once heard him say something similar to that.
That is wrong to call someone retarded. That is a very rude word and an insult to mentally disabled people.
You shouldn't say that my opinion is retarded.
I would encourage you to find a less sensitive word to use in such an insulting manner. That particular word is hurtful to disabled people and their family members when they hear it used in such a demeaning way.