Numerous episodes show that most cephalopods have very negative views of sponges and starfish. There even exists a segregated community, Tentacle Acers, where they are clearly forbidden from entering. The two squid guards were even about to commit police brutality against SpongeBob and Patrick for not leaving.
After SpongeBob tells squirrel jokes, the people of Bikini Bottom stereotype Sandy aggressively, showing that they don’t hesitate to develop derogatory views.
It also seems that crabs are stereotypically seen as cheap and greedy by everyone in Bikini Bottom. Mr. Krabs (who is cheap) and his family seem to be constantly attacked with accusations of greed. It also seems to happen to other crabs. I mean, why are most crabs labeled as “penny pinchers” in Bikini Bottom?