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

They're only working at this place temporarily and have never socialized with these people. Why do they want to see their new ...

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

She immediately said, “I hate it when people say that,” and continued to complain about people always saying that.