Anti-fan
An anti-fan, hater, or anti is someone who enjoys writing, discussing or in some cases making derivative works about a piece of media, but solely for the purpose of railing against or parodying it. Someone who opposes a ship (a romantic pairing between two characters) is called an anti-shipper.
It can also be a person with hatred towards a celebrity or icon. Haters often attract other haters to create a negative community.
There is a common saying that "haters attract haters," which suggests that individuals who express negativity or hostility may draw similar reactions from others. This idea is rooted in the concept of reciprocity, where negative energy or behavior can be mirrored and reciprocated by those who encounter it. These haters are often found in negative communities and thrive off of their own negativity.