Kataang vs Zutara
|ShipWar:||Kataang vs Zutara|
|Fandom:||Avatar: The Last Airbender|
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Kataang is generally considered to be the "winner" of the ship war, since it became canon in the series finale and their relationship was further explored in post-canon stories and The Legend of Korra. This has not stopped Zutara's popularity, though, or the fans who still wish or believe it should have been the canon pair.
Zutara shippers developed into two camps: those who were simply passionate about their OTP and those who insisted it become canon. The "cave scene" in "Crossroads of Destiny" was an infamous moment in the shipping war.
During the third season, the increased Kataang shiptease (as well as the reveal of Mai as Zuko's love interest) led to outcry among more militant Zutara fans who ranted that the episodes were "bad" and "OOC" and looked for any sort of hints that would favor Zutara. The less they got, the more intense their anger and bashing became.
This led Kataang shippers who felt pushed too far to start fighting back viciously. Initially the majority of this was merely counterattacking the arguments against Kataang or the personal attacks on the fandom, but they quickly became just as petty and nasty as those they were fighting against. Some extreme Kataang shippers would attack Zutara and its fans for the sake of it. Some even went as far as to say all Zutara shippers were delusional idiots, even the ones who didn't fall under the "militant" category.
The finale saw Zuko getting back together with Mai and closed out with a romantic kiss between Aang and Katara, initiated by the latter. Zutara fans were livid.
More extreme shippers launched smear campaigns against Bryke, who they felt "ruined" the series to satisfy their own egos, and even went so far as to attack Kataang shippers. Some even tried to claim that everyone on the staff except Bryan and Mike shipped Zutara in order to validate their insistence that their ship should have won, though many of them failed to provide proper context or evidence.
When The Legend of Korra was announced in 2010, it was revealed that Aang and Katara had stayed together and had a son, one of the characters revealed in the trailer. This angered Zutara fans who had hoped the canon pair would break up somewhere along the line, freeing Katara for Zuko.
Results of the Conflict
A good number of Zutara shippers proved to be graceful "losers" and would go on to apologize for the behavior of their more rabid counterparts, who would continue to deny canon or try to make it look bad.   
In turn, some more extreme Kataang shippers became especially smug, bragging constantly about their ship "winning" and alienating shippers on both sides who just wanted to live and let live.
In 2020, Netflix began airing the series, re-igniting the shipping war.