The way you’ve framed this suggests this isn’t the case, but putting myself in this situation the qualifiers for each option would be reversed:
- stay home and disappoint everyone
- go out against my better judgment to make others happy
In which case I would certainly pick the first option: it is OK necessary to disappoint others for the sake of your well-being. This applies here if your well-being = going out, and saying your abdomen hurts = disappointing others.
I was joking when I made the post but I probably would go as Screaming Mantis. Money being no object means I get six extra fully functional arms for eating Halloween party food