The term valid is used to establish that something is logically correct. Having a logically reasonable basis for an argument or debate is called valid. This can also be considered an acceptable thing when you are discussing something.
People consider a point valid on social media when it makes sense according to the general understanding of a perspective. Being called valid is a positive affirmation because you have made your point, and the other person has also understood it.
Example
For example, you engage in a legal debate with someone and talk based on logic and facts. Your points will automatically be considered valid by the other person.

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