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Could Squidward be coded with shcizotypal personality disorder? If I recall correctly he has very few close personal relationships if any at all. Furthermore he didn't seem to have a desire for them either from what I remember.
Also, I have heard some say that because of how SpongeBob behaves that he may be on the spectrum/ASD coded with regards to how he socializes.
I think this is the transition from childhood to adulthood. It's kinda like Tom and Jerry.
Once you're a kid, you're a Jerry fan, rooting for the mouse, annoyed by Tom. Once you grow up, you realize Jerry is an absolute asshole and poor Tom has to deal with his bullshit. >

When I was a kid, I always wanted Gargamel to catch those smart Alec smurfs. >

Unpopular opinion? Next thing you're gonna tell me is that Zack Morris is trash! >

Congratulations, you've grown up.
The true measure of adulthood is whether you consider Squidward the victim or villain. >

Neither are assholes just two incompatible people forced by economic circumstance to be in close proximity. Neither of them are “bad” people >

The funny thing is Squidward can move, in fact he has before. 
There is that one episode where he moved to a neighbourhood with people not that different than him. 
Problem is, after several weeks, he realized how boring it is and moved back. >

This heavily depends, there have been some episode where squidward was an asshole who bullied SpongeBob. But yes on average SpongeBob is the asshole >

like that time he read his diary to everyone. >

Is this really unpopular? I think most people agree on that >

Never heard it >

It doesn't have to be just one of them. Spongebob is an asshole for not leaving Squidward alone, and squidward is an asshole for being rude to everyone and everything around him. >

SpongeBob clearly has a man crush on Squidward. Plus he lacks serious boundaries. When a person says leave me alone leave them alone. >

Never liked SpongeBob, everyone else was better than him >

Patrick is the real asshole, he's the worst friend ever. >

I feel like once you get older, Squidward becomes more relatable >

The creators saw the future. >

In case you hadn't noticed, poor SpongeBob is suffering from Bipolar ll disorder. He seems overly emotional at times and he just can't help himself in during one of his manic episodes.
I think his time would be better spent trying to cheer up Patrick, who is, no doubt suffering from severe major depression.
Meanwhile, Squidward is extremely introverted. And will never enjoy the company of anyone. Let alone a high maintenance friend like SpongeBob