I am a bit confused by some of the replies because I think Miss Manners is pretty saying "you don't have to reciprocate in exactly the same way to reciprocate but not reciprocating at all is likely to make someone feel undervalued" but lots of people are saying they disagree with her but say the same thing?

We used to entertain a lot because I love it but there are some people we stopped inviting because they never initiated anything - it didn't matter to me that they didn't invite me over for dinner but it did matter that they never suggested a coffee or a walk or a theatre trip