Here's a list of excuses I've heard whether someone is home alone, sickness, death, in hospital, retired citizens home or just lonely:

I hate hospitals

I don't know what to say

I SHOULD go visit

I"ve been SO busy

I don't have time

She/He complains too much

I don't feel welcome

I can't handle it

She/He's changed

I hate the smell

She/he don't know your there, anyway.

He/she talks to much

It's boring there

I don't like the husband/wife

The kids get on my nerves

and Chatty's rude friend's comment

The list of excuses is long and valid enough for the ones giving them. Unfortunate isn't it?
chick