No more “clean” than other posters. You just need to read between the lines of what others post. I think they call it patience. Or is it maybe tolerance?
Good question. Especially how it was you who first used that adjective. It isn’t one I would have chosen, but perhaps the fact that you chose it is a reflection of your mindset. I’d have probably gone for ‘aphorism’.
Nothing at all. However, as they say in the movies, a rose by any other name…

Well, we aint gonna make any progress until you not only read between the lines to better understand people, but also not until you learn to read accurately what others write. I already stated it is that which is discerned, mind independent and universal and accepted as the norm. The norm, of course is not about one single behaviour, but refers to many different behaviours, the sum of which constitutes human nature. Of course you already know that and you know I know you know, so if you want to call a spade a spade, stop playing childish games.
Tell that to the scientists, shrinks and philosophers who study it.Are vyou saying cannibalism was a universal human behaviour? Gee whiz, even Wiki tells you that isn’t so.You are again trying to generalise from the particular. It doesn’t work. By the way, ancient Egypt is a good example of one of those failed empires I mentioned earlier. Same mistake again. Now if Aristotle had followed your methodology, we’d be all up the creek without a paddle. You are not giving examples of behaviour which can ever be considered as “normative”. medieval Europe covers a very long period of history. Can you narrow it down a wee bit? After all, medieval Europe was totally catholic and was so right up until the Reformation. It seems you must have even more examples of aberrant behaviour tucked away in your head. You mean they sold LSD in 1911?! Now pull the other one… Haven’t you heard of annullments? This statement opens a can of worms. Just because something is widespread doesn’t mean it is “accepted”. There seems to be quite a hue and cry against the social harm being caused by the high divorce rates. Divorve is also not accepted by all people in all societies, so until we can get some stats on the subject, I’d not hasten to say it is universally accepted. You should also realise that divorce is a good example of natural Law ethics being abused. I wouldn’t know, but you seem to be suggesting that there was less love for certain family members back then. I find that hard to beleive.
Actually, the norms of behaviour always remain the norm. Whether people continue to adhere to them is another question. Like I said, the world is full of examples of failed empires and failed individulas…
So, are human’s capable of morphing into something not human? Could it not be the case that there are certain traits that todays humans share even with their ancient ancestors? How about basic survival instincts, like the will to live? We know certain people kill themselves, but does that mean the will to live is not universal?
Actually, if you want to put your cynical mindset to work productively, you might be able to figure out what the words actually mean, just as Aristotle did and the Stoics before him. Can you, for instance, put together a list of human traits which are indeed discernable as being universal? Come on, I bet you can.