Don't take me for a fool.
http://www.google.com.hk/search?hl=en&client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&hs=5EF&q=don%27t+take+me+for+a++fool&btnG=Search&meta=
Don't take me as a fool.
Don't consider me as an idiot.
I wasn't born yesterday.
Don't treat me as a fool.
wo shi sha zi