Well, it’s partly because to one person, ‘different posture’ doesn’t really mean all that much (whether this is due to that person’s culture, upbringing, personal style, studies, or a host of other possibilities), but to another (likewise due to culture, upbringing, personal studies, studies etc) it DOES mean more than a 'little thing.
Rudyard Kipling once wrote, “East is East and West is West and never the twain shall meet til Earth and Sky stand presently at God’s great judgment seat. . .” Sometimes I do feel when it comes to both ‘little’ and ‘great’ things, East is East, West is West.
Depending on the POV, there is merit both to the idea that one need not sweat the small stuff, so to speak. . .
and that “if one does not root out the little issues which are problematic, one is likely to face BIGGER issues later on”.
Easy going people of a certain ethos, culture, and understanding, in a certain place at a certain time, are more likely, in all areas of their lives, to think that “little things don’t matter so much; diversity is great, I’ll do my thing, you do yours”.
And more ‘focused’ people of a certain ethos, culture and understanding, in a certain place at a certain time, are more likely, in all areas of their lives, to think, "I have seen so many times that great cultural changes start out with ‘little things’; so ‘little’ that most people barely notice. . .then the changes become greater and greater, and because one has never from the start challenged the ‘first’, ‘little’ changes, one is inexorably swept up into the ‘big’ changes and any attempts to stem the tide involve far, far greater effort.
A lot depends on what you yourself have experienced. If you have never really faced the ‘second’ scenario, you’ll probably find it hard to believe that such a great, culturally approved idea of ‘tolerance’ and ‘not sweating the small stuff’ and ‘personal diversity’ could EVER be a problem! You think the person who even HINTS such a thing must be a rigid, judgmental boob, probably with a sinister agenda aimed at hauling Catholics back into the Dark Ages.
And if you’ve lived through the second scenario, you will likewise find it hard to believe that those ‘little things’ do NOT bother a lot of your fellow Catholics. You want to almost shake them from what you see as either apathy or totally misguided ‘tolerance’ and SHOW them just what this kind of wrong thinking has given society in the past 40 years – all of which started from ‘little things’. You want to yell, “Wake up! We are in danger of losing our very souls to Modernism, relativism, and indifferentism, and never EVEN NOTICING!”