When you think of validation, you might think that it involves simply agreeing with the other person no matter what but..
That would be a misunderstanding of what validation is, when in reality, to validate someone is to acknowledge them (their thoughts, emotions, and behavior) as legitimate and worthy of attention, even if you don’t necessarily agree with them. Validation is important because, in any relationship, it’s important to treat the other person as an equal. To treat others as equal involves understanding and valuing them as much as you do yourself. Consequently, invalidation involves not treating a person with the legitimacy and attention they deserve, and to ignore them or otherwise belittle their experience to the point where they feel alienated. Keep in mind that this also applies to one’s own self, as one can self-validate or self-invalidate. One should be aware of the different aspects involved in validation and invalidation, as they aren’t always self-explanatory.