Which ship do you hate the most and why? For me, it's 
X 
. They have no reason to be shipped together. They have extremely different personalities and morality, which AREN'T opposites so that kind of ship is out of the question, and they probably don't even know the other person exists.
It's hard for me to add an example which doesn't carry some biased hatred towards one of the individuals. Like with 
and 
, part of my dislike towards the pairing stems to my dislike of Lee Sin as a champion in-game (part of it is also I can't think of her being with anyone but 
, but that is beside the point).
The same goes with 
and 
, my dislike of the pairing stems from my dislike of both of them (Tristana always annoys me whether on my team or the enemy team, and Teemo and his fanbase - my personal opinion, irrational as it is - can go burn in Brand's fire).
There are some pairings I like, even if I don't particularly care for one or both of the champions involved, for example 
and 
I like as a pair, even if I'm not a fan of Jarvan himself, mostly cause it'd be funny for Jarvan V and the rest of the Lightshield line to suddenly become Dovahkiin.
But there is one pairing I just dislike straight out for the pairing itself: 
and 
, which is sad considering I like both champions (even if I get annoyed with Tryndamere in-game at times). It's not inherent against either of them, I just don't like them together, more so because lore-wise they are together for political reasons, and honestly they are cooler if they are off by their lonesome. I mean if they had a deep lore involved with each other, I could understand and support it, but they are just together for the sake of power.
It would be like if 
and 
got together strictly for political reasons, if they had some deep lore together I could see it working out. Hell, the old Pentakill lore mentioning the band's fourth Album, Death Rides a Pale Boar, suggests something between Pentakill Drummer Olaf and Sejuani beyond being just friends. That's better basis for pairing writing there than the 'political marriage' line, especially since it doesn't enhance or change who those champions are... it's just... there.
Because it's just not true.
/
Zed is an asshole and does not deserve happiness.
