Invalidated feelings have a way of coming back to haunt the relationship over and over.
Most people would deny that they invalidate the internal experience of others.
Very few would purposefully invalidate someone else.
When we are invalidated by having our feelings repudiated, we are attacked at the deepest level possible, since our feelings are the innermost expression of our individual identities. As a parent I want to teach my kids these things Ive learned.
Telling a person she shouldn't feel the way she does feel is akin to telling water it shouldn't be wet, grass it shouldn't be green, or rocks they shouldn't be hard. Whether we like or understand someone's feelings, they are still real. So when they felt bad or angry I tried to help them find a way to make themselves feel better.