When there are cases where there is ambiguity, such as here where the consonants are the same and the only difference is the nikud, it's acceptable. Without the nikud, there would be no way to know if this sentence were ani shoteh or ani shotah, but when there is no ambiguity, they are almost never used outside of religious and children's text.
I can't add a nikud, or haven't figured out how to, on my computer. Still, it's disheartening to be marked wrong.
To listen to the pronunciation of all words go here: