be not (one's) cup of tea
To not be something one prefers, desires, enjoys, or cares about. Thank you for the invitation, but long-distance cycling just isn't really my cup of tea. When I found out that reading wasn't his cup of tea, I knew that there wasn't much of a relationship in store between us. Baking's not my cup of tea—I don't like having to measure every little thing so precisely.
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