Same.

I spent four years in a job I hated, with people who were jerks, and my boss insisted on taking me out to a work lunch before I transitioned out. I was stuck for two hours with them, chatting like these weren't the most awful people, some of whom who had gone out of their way to bully me or withhold training (for fear of layoffs), and it was uncomfortable and unnecessary.

I went with it because it's generally good practice not to burn bridges. You just never know what could come back to haunt you.

Pro tip, though: Just tell your boss you have diarrhea next time. They'll gladly let you out of it. Digestive issues are the catch-all for when you want out of something with minimal blowback. (Pun intended.)