I agree with woahwoah678. Squidward is a jerk. Here are a couple of reasons.
1.He started treating Spongebob like a maid when Spongebob let him stay at his house in Can You Spare A Dime?
2.He tried to break Spongebob and Patrick up in Nautical Neighbors.
3.He wanted to push Spongebob in sea urchins in No Hat For Pat.
4.He destroyed the machine that could have helped the gang find Spongebob in What Ever Happened to Spongebob?
5.He tricked Spongebob into doing his job in Squid's Day Off.
6.He tricked Spongebob and Patrick into doing his bidding in Squidward the Unfriendly Ghost.
7.He scared Spongebob in Scaredy Pants.
8.He didn't feed Gary in I Was A Teenage Gary.
9.He was celebrating when it looked like Spongebob had to move away in Home Sweet Pineapple.
10.He embarrassed Spongebob with a mean April Fool's prank in April Fools.
11.He wouldn't let Spongebob in the Talent Show in Culture Shock.
12.He wanted to pop Bubble Buddy in Bubble Buddy.
13.He laughed at Spongebob in Grandma's Kisses.
14.He taunted Spongebob and enjoyed his pain in Christmas Who?
15.He harshly criticized Spongebob's sculpture because he was jealous in Artist Unknown.
16.He teased Spongebob in Patty Hype.
17.He begged for mercy from Spongebob when he thought he was a ghost then laughed at him when he relized he was just sun bkeached in Sun Bleached.
18.He makes fun of Spongebob and Patrick in Club Spongebob.
19.He acted like a pompous jerk and made fun of Gary in The Great Snail Race.
20.He tried to make Spongebob and Patrick fight each other in Snowball Effect,
21.He enjoyed the fact that Patrick had to fight a lion in Spongicus.
22.He called Spongebob and Patrick gullible in The Camping Episode.
23.He tried to take credit for Spongebob's idea to get Mr.Krabs a mattress in The Lost Mattress.
I'll name some more later.