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This leaves the rejects wondering what they said or did to be dropped in this manner.

A few years ago when this whole friend feature was introduced I initiated a few friend requests.  All were accepted with the exception of 1 request, which was declined. 

I think other people were more upset about it than I was though.

I don't have any problems with anyone here so I've accepted all friend invites!!

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi