Holyhannah Validation is one of the most important aspects of parenting. It's pure love and acceptance. Its valuing that person, their experience and most importantly their feelings and it is what creates strong confident children who are resilient and feel secure.
To invalidate someone is the opposite. It's denying, dismissing, rejecting someone's feelings or experience (two things that impact each other) as wrong, unimportant or just plain unacceptable.
Its invalidating to dismiss another's experience because it doesn't match your own experience and definitely rude and invalidating if it doesn't match your opinion. Experience is infinite, there is not enough time in any of our lives to know or experience all of everything. Not in a hundred lifetimes.
Its not necessarily abusive, or even deliberate, sometimes its well meaning people can have the best intentions in the world and still be unable to handle the strong emotions of someone who has been hurt or they might genuinely believe that using their experience in comparison is helping you. They may not understand that feelings and experiences don't go away just because they are questioned or someone is told they shouldn't feel so bad.
The absolute best way to avoid invalidating someone is to always validate them.
This is very simple. Validate their feelings or feelings AND experience. Agree and empathise. If you absolutely cannot relate to their experience, empathising with their feelings is enough. All emotionally healthy people do have experience of how all the feelings feel and how awful some of them can get.
Using your experience or feelings to argue against someone else's, not only invalidates them but ensures you will get no validation for how you feel either.
People's experiences and feelings are simply unique to them.
So how can people with different experiences and feelings on the same subjects still validate each other?
Don't say:
I disagree...
Well, in MY experience...
My situation was worse because...
You are the most out of order because...
Etc
Simply offer validation and understanding.
Or bring up your personal feelings and experience as a seperate unique issue untied to theirs and remember that someone else's experience does not negate yours and that should work both ways. So if you feel attacked by their experience/feelings, you need to realise that's not their fault or responsibility.
Anyway I've lost track now.
Basically validate validate validate. You absolutely cannot go wrong validating a person's feelings even if you can't relate to their experience.