1. What does it mean?
극혐 compresses 극도로 혐오하다, expressing that something is intensely unpleasant or repulsive to the speaker. It is much stronger than simply saying a flavor or style is not your preference.
Also written or said as geukyeom
2. The nuance
Directed at a person or group, it can be demeaning and hostile. Describing a specific behavior is clearer and less harmful than branding someone disgusting.
3. Examples
“스포일러를 제목에 쓰는 건 정말 극혐이야.”
Putting spoilers in a title is something I absolutely hate.
“음식 취향이 다르다고 극혐이라고까지 할 필요는 없지.”
There's no need to call something disgusting just because food tastes differ.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.