Back in its heyday, Pirates of the Caribbean fandom was split into approximately three groups: the people who wanted Will/Elizabeth (Willabeth) to happen, the people who wanted Jack/Elizabeth (Sparrabeth) to happen, and the tiny group who completely stayed out of it and just watched the madness, usually complete with pointing and laughing. On one forum, these "debates" got to be so bad that the administrators completely shut down all "shipping debates", and had to relegate the respective shippers to their own discussion threads
And it wasn't just that forum either... fans on a certain website's message board did it too. To extreme levels. There was a point where there was nothing on said forum but shipping "team" threads, and bashing of X character.
The Star Trek fandom is split between Spock/Uhura, the Official Couple, and Kirk/Spock, the grandaddy of all slash pairings. Some of the fighting has gotten very nasty, resulting in some very homophobic remarks from Spuhura shippers and accusations of Abrams "pandering to middle America" from Spirkers, as well as some racially-tinged Ron the Death Eater directed at Uhura.
Not even Pixar is safe anymore. Ever since Toy Story 3 came out and the amount of Buzz/Jessie shippers increased tenfold, shipping "debates" have sprang up. More extreme Woody/Jessie shippers defend their side till the end, some seemingly convinced that Pixar is intentionally toying with them (no Pun intended). Still, Buzz/Jessie shippers aren't innocent either, as some will jump on any Woody/Jessie piece and decry it non-canon. Then you bring Buzz/Woody into the mix...no wonder people like the idea of a Toy Story OT 3 so much.
Teenage Mutant Ninja Turtles In-universe in the 1990 live action movie, which provides the page quote, with Donatello and Casey Jones arguing about Gilligan's Island. Casey thinks the Professor and Mary Ann are the better couple while Don prefers Gilligan and Mary Ann.
Also in the MCU, any mention of the possibility of a love triangle between Thor, Jane, and Sif in Thor 2 has led to snide remarks being traded between Thor x Jane shippers and Thor x Sif shippers, occassionally interrupted by Team Loki. Odin help us all if they actually go with the love triangle in the sequel.
Probably due to the very small cast, the Maleficent fandom is relatively peaceful - the most common ships are Maleficent/Diaval and Maleficent/Aurora, and they have a different target audience. There is also Aurora/Philipp, which gets along well with Maleficent/Diaval, and, an outlier, Diaval/Philipp, which again has a different target audience than all of the above. The most heated debates are about whether one should ship Maleficent with Aurora - some think it borders on incest as the characters were so close when Aurora was still a child, others say that that's just another excuse to Hide Your Lesbians. As all the shippable (i.e. not evil, non-human or very unimportant) characters are portrayed positively in the movie, there seems to be no debate as to whether people deserve each other - the worst accusation against Philipp is boringness, and in lesbian shipping he's usually allowed to hang around the main characters as best friend. Same with Diaval. And then, of course, there are those who ship all the main characters together..