Catholic frumkeit

Why don't Catholics have a concept of frumkeit? All Catholics, regardless of personal piety and personal levels of observance, can attend the same churches and live in the same neighborhood without any problem. They aren't worried about being tainted or corrupted if the neighbors are less sincerely Catholic. They don't start new congregations over issues of liturgy or decor or in protest of something the priest said. They don't create new Catholic schools to emphasize minor philosophical differences at the drop of a hat either 

From what I understand Sephardic Jews are above these sort of petty and narcisstic divisions, too. (Yes?) 

So why do the Ashkenazi OJs have this hang up? Why do we live in mortal fear of looking un-frum or of being tainted via association with the less frum? Why do the shul and the neighborhood and the school have to be exactly perfect in terms of style and hashkofa and every last stringency and leniency in order for us to feel safe? Looking for sociological explanations, not religious justifications please.