I'm not calling anyone stupid based on whether or not they fall victim to disinformation, those are your words and that low barrier is your intelligence measure. Based on my observation, that's a mark on how much you care about a candidate more than anything. Someone who really cares about their candidate (likely because in their life they're seeing reason to care about this candidate) will be on top of things. Someone who could hardly give af about a candidate (likely because in their life they're seeing no reason to care about this candidate), will hardly give af enough to fact check things.
There is no "whether you know it or not". People spend 24 hours a day paying bills going through life, they know their lives. If they're looking at their 2024 life and not seeing anything Joe Biden did that makes it any different than their 2014 life, they're not going to care enough to check any facts about his VP who said she wouldn't do anything differently. Stronger policy fixes that.