there's no accounting for taste

In subjective matters of taste, people have wildly different opinions; disagreements about matters of taste cannot be objectively resolved.

日本語の意味

趣味や嗜好は主観的なものであり、人それぞれ意見が大きく異なる / 味には客観的な基準がなく、個々の好みは十人十色である

I can't understand why he likes that painting, but there's no accounting for taste.

彼があの絵を好きな理由は私にはわからないが、人の好みは千差万別だ。

意味（1）

In subjective matters of taste, people have wildly different opinions; disagreements about matters of taste cannot be objectively resolved.