What do you mean 0 tolerance for stupidity? SpongeBob and Patrick are with her all the time and she's never flipped out. In Karate Island, a frequently panned post-movie episode, Sandy is originally bothered but she eventually comes arounf and consideres him the king of karate in her book... how is that 0 tolerance?
Sandy dealt with the town's 'stupidity' in the beginning of Sandy, Sb, and the worm... how was that 0 tolerance?
Heck, forget episode examples, HOW would Sandy be friends with SpongeBob and Patrick if she has '0 tolerance for stupidity'... ::dolphin noise:: how would she even LIVE in Bikini Bottom?
Okay buddy, well guess what? THere's this thing called morality. Morality should not get a pass just because 'it's a cartoon' because a deviance from morality is ugh. Feeding friends dangerous food in a normally happy show is not appropriate and in-character, especially for Sandy. SHE DOES NOT WANT TO KILL PATRICK--that's out of character. Yes, it's out of character for any of the main characters to do such a thing regardless of who kills whom--even Plankypoo almost killing Krabs.. it's never right.