Props to J$
J$ . Thats a really interesting train of thought. I don't know what happens when you carry it its logical conclusion.
I have noticed a similar phenomenon with respect to reading. My opinion is influenced disproportionately by recent reading, and less so by books back in time to the beginning of my literacy. The books that I don't even remember reading are somewhere in there, forming a part of my inchoate and unattributable "knowledge" which really isn't knowledge, since I am effectively inheriting the biases of the authors.
The same thing happens with my moods. I can be having a great day, then get a speeding ticket, and the whole day sucks. Career works that way too.
If you begin with the premise that life is more constant than it is changing, we shouldn't over emphasize recent experience like we do.
I'm not sure where I was going with this? It was just interesting to me, and got me thinking about knowledge.
Maybe the trick is to allow yourself to guiltlessly use the heuristic of stereotyping (or "ideal typing") but to maintain the openness of mind and spirit to challenge the model and admit the depth and breadth of human indviduality. Then recognize humbly the vastness of possible knowledge, the limitless gradations of fact and truth, and the limitation that some people will act differently that you expect, simply because you expect it.