1. What does it mean?
불호 labels something the speaker does not like or favor. In reviews and comment threads, 저는 불호예요 can communicate a personal reaction without claiming that everyone should dislike the same thing.
Also written or said as bulho
2. The nuance
It contrasts with 호, a positive preference. It is milder than 극혐, although a bare 불호 response to someone's creation can still feel blunt.
3. Examples
“영상은 예쁜데 흔들리는 촬영 방식은 나한테 불호야.”
The video is beautiful, but the shaky filming style isn't for me.
“민트 향은 불호라 다른 차로 골랐어.”
I'm not a fan of mint, so I picked another tea.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.