Affirmative Action, my ass! I'm calling my local chapter of SPONGE. I'm sick to death of Section 8, welfare, food stamps, free lunch, Title I, and the United Negro College Fund. It's high time whitey got some bennies.
Spongebob often shows many signs of stupidty, and simpleness.
The simple/stupid person normally performs an action which makes them look stupid, and their brain is useless.
When calling one a sponge, you are referring to their lack of intelligence.