Man-UP

You were wrong then, and you're wrong now.
The good news: its just your immaturity, you'll grow out of it.
The bad news: boys mature slowly....

The victim is nothing without his sympathizers.

It's hard for me to sympathize for someone who begs for sympathy (especially a child I wanted to raise to be stronger).

...but then, he cried - all of the time it seemed, and usually without much reason - and so maybe this was destined?

When you are the one treating others with disrespect,
accusing others of being "haters",
telling lies about them, and causing others to cry - then,
it is not really you that is being victimized, rather
it is you that is victimizing...

Exhibit "A": Facebook posts that all scream "poor me"

I think
that there are people who,
in actuality,
wish they were mistreated or abused
just so they can have a valid victim card to play...
But then,
those people are pretty good at making up sad stories anyhow.

Were these crying tantrums manifested from the favoritism displayed for him by so many? Thereby training him to desire and expect this treatment forever?
Maybe..... 
I think so anyhow.
They lasted even through middle school.

Apparently, I can't expect a level of maturity more than your age... I must keep reminding myself of this.