Every time you mention something that concerns you, they bring back the attention to them saying something like "Yes! reminds me of what happened to me last summer..." totally forgetting about your story!
Yes! Frustrating! ;)
This is a lack of social skills from that person and as well lack of interest.
Now, again, it is stupid to want validation from a specific person when you know you won't get it from them.
It takes much more time and energy to educate that specific person rather than finding someone else who is more skills socially and will be able to to validate your story with a keen interest.