Colleagues A and B chatting right behind me at work, A is buying a car and was talking about how to choose. At an appropriate time in the conversation I turned round and asked what she was looking for and agreed with the pressure of the purchase cos i had had to do the same for our family car. Few more mins of chat then she left.
10 mins later I saw an email on B's screen saying she left the conversation cos "rollon making it all about her was doing my head in"
Am I missing something? Isn't sharing your experience something that normally happens in a conversation? I was agreeing with her!
In this incidence fuck em tbh as am leaving job next week but would hate it if all other people i knew thought I was just a self centred cow!! 
Just to add, we do all chat generally so it didn't appear to be a particularly 'private conversation and if it was, don't bloody have it 2 feet away from me!!