Try this
- State your preference about the activity itself without evaluating the taste of the person who likes it.
- Explore whether a partial overlap or separate plan would fit. Do not offer attendance you already know you will resent.
A worked example
“That activity is not for me. I would enjoy joining you for dinner afterward.”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
Offer separate participation as a legitimate option when a combined plan does not fit.