One man’s meat is another man’s poison
Definition 1 of 1
Pro Tip 1/3Cultural Variation
This idiom can be culturally sensitive; what's common in one culture might be disliked in another. 
While spicy food is a delight in India, one man's meat is another man's poison; it may be too much for some from other countries.
Pro Tip 2/3Subjectivity
The phrase stresses how personal taste is subjective and not a universal truth. 
He loves abstract art, but one man's meat is another man's poison; I just don't get it.
Pro Tip 3/3Conflict Avoidance
Use this phrase to diffuse disagreements about preferences politely. 
I understand you dislike this music, but one man's meat is another man's poison, so let's change it.