Squidward is rude, pathetic, snobby, grumpy, miserable, sarcastic, apathetic, pessimistic and sometimes sadistic. He views the world in such a negative light that he is rarely seen greeting anyone with a smile. He loathes his job at the Krusty Krab and is often seen sleeping or reading on the job instead of working. Despite his temper, he is still one of the most intelligent and educated characters. He has a cynical attitude, a grandiose sense of self, and sees others as uncivilized morons while failing to accept his shortcomings. Squidward sees himself as misunderstood and unappreciated, blaming society for his failures.
Basically every 21st century teenager.