"None of these people have ever socialized with me, so I find it odd and awkward that they would suddenly invite themselves." ...

(She) insists that when I am offered another helping of food, it’s rude for me to reply, “No, thank you, I’m full.” ...

Miss Manners understands that people who have trouble saying no might be sorry to disappoint those who importune them. Or ...

I have not worn any kind of nail polish since I was in my 20s. I do not want to polish my toenails, or my fingernails, either ...