In this example, this is more commonly referred to as disgust sensitivity, in terms of bias towards cleanliness. A parent with higher disgust sensitivity, like an Si dom who has higher conscientiousness, will be more readily able to notice things which are unclean. Generally those with low Si/Ni have low disgust sensitivity based off the correlation between conscientiousness and disgust sensitivity. Therefore those with low Si/Ni not notice their rooms being untidy as often as those who do. They do notice, it's just less often because they do not have the brain mentality for it. ENTP/ENFP/INFP/INTP for example will emphasise Ne, openness to experience, over something like conscientiousness, Ni/Si, etc.
The "fact" bias, that it is dirty is not detected, because there is no recording of the data being disgusting or not - so there is no bias because there is no choice made to diverge. I get your point, that what is observed is varied between the mother and the child in this - which makes the meme accurate, but an Si inferior will not even detect it, to then lead to divergence for an overall rhetoric. Once they do, it will then lead to cleaning at some point.
Nice meme though, thanks. I had heard of confirmation bias but not delved down that side of the rabbit hole I think. Appreciated.