Your perception will change all the the time. That's called being alive. If your perception never changed you would never have learnt anything. If back at school I shut my ears and said that's misinformation to the teacher then I'd still be the equivalent of a uneducated child.

New discoverys and data that contradicts previous data emerges all the time. Maybe galileo saying the earth revolves around the sun should still be considered misinformation? It is was at the time. One years heresy is another years staple of knowledge and widely accepted fact.

If you are talking purely political then it's bias and is beneficial to one side. Both sides are equally guilty of flat out denial from my outside perspective.

Honestly though you seriously don't want to be able to determine if something is disinformation for yourself? You want to be told what is disinformation? Seriously? I wish I had your mentality