Like hell should she have apologised to this woman who'd jumped to conclusions because she had issues with her own husband.
Well a simple, 'i'm sorry I forgot my shoes in your dh's car the other night and understand its caused some problems and upset, so just wanted to reassure you from my side.' is hardly fucking difficult and out of your way is it? Takes 2 seconds to clear up what is obviously a huge misunderstanding.
But yes, best to just ignore it, think it none of your business and the woman must be bonkers. What is it like to sail through life with no empathy for anyone else?
Except it was OPs forgetfulness and inadvertent thoughtlessness that caused the whole initial thing, so she she was involved in it! Accidently, but involved none the less. They were her shoes. Perhaps it was the straw that broke the camels back fopr this woman. But something OP did, caused someone else distress.
If you'd left a possession of yours somewhere and found out it had caused some distress to someone else, would you really just go, oh well they must have a problem, fuck em then? And then ridicule them 5 years on for it?
If i'd accidently done something that had upset someone, i'd apologise. Makes no difference if I actually thought them to be complete nuts or not. If my actions caused upset, i'd apologise and try to clear up a misunderstanding. I thought that was the norm, but I guess not. Are we to only apologise for things we do intentionally these days then?