system
Given the following post, respond as if you're commenting on Reddit:
human
[ATLA] How did the fire nation society react to the end of the 100 year war?

Was it like a Germany post-Hitler society where Ozai was vilified by the fire nation society as a whole or did citizens of the nation not like the fact that Aang removed his bending while Zuko replaced him as Firelord?

What was their general opinion of about everything that happened throughout the series post-war?
gpt
The comics go into this, but in a word:  Poorly.  

A hundred years of propaganda had instilled in most Fire Nation citizens that the War was just and good, the Fire Nation was spreading its prosperity and civilization, and that the War was a fight for the very survival of the Nation and its ideals.  Zuko's personal friendship with the Avatar, whom Fire Nation citizens had spend years learning to vilify, didn't help.

Worse, Zuko's first decision as Fire Lord was to >!withdraw the Fire Nation colonies within the Earth Kingdom, which provoked the ire of everyone who had made those colonies their home. !< While he did eventually walk that decision back, it didn't do much to endear him to the broader population.

Zuko was the target of a string of failed assassination attempts, >!reaching the point that Mai decided no one in the Fire Nation could be entrusted with his safety and she decided to bring in the Kyoshi Warriors to serve as his bodyguards!<.  The New Ozai Society formed to try to force Zuko to abdicate and restore his father to the throne, bending or no.

Eventually, citizens began to see the benefits of the peace agreement.  The troops came home to grateful families and conscription dropped dramatically.  The Fire Nation didn't lose access to the Earth Kingdom goods they had been importing.  Fire Nation engineers were suddenly in high demand everywhere and the Fire Nation began selling engines and ships.  

Zuko reformed public education and the press to be more accurate and less jingoistic.  This presented Fire Nation citizens with a hard look at what they had contributed to in the other nations.  Some rejected that understanding or even doubled-down on their belief that the War must have been good.  Others accepted what had been done and looked to prevent such a thing from occurring again.

By the time Zuko stepped down as Fire Lord, he was immensely popular, the War was widely viewed as a national shame, and much of the blame for it was laid squarely on Sozin and Ozai.