Question again...
Why is there animosity between the single sex schools and their local counterparts of the other sex ie HC/Guerin as explained in this thread?
Is it typically over something specific between the two schools because after reading this thread it seems more wide spread
Great question, Bones.
I'll attempt to answer it, but I don't really have much more than opinion and anecdotal observations based on my, ahem, 50+ year association with Catholic education (the only public school I ever attended was for kindergarten and a summer school typing class, my own kids have a combined 47 years' worth of attending Catholic schools, plus I worked in and for Catholic schools for almost 15 years -- although not currently). Since the mid-1960s, there has not been a single year where I have not either attended a Catholic school, paid tuition to a Catholic school, or had a Catholic school put food on my table.
Pertaining to the boys vs girls schools relationship, I wouldn't label it in general as animosity. At times there might be animosity but, on an ongoing basis, I would refer to it more as strained relations. These strained relations have, at their root, the battle of the sexes that has been raging since the beginning of human existence. More specific to these schools' Catholic identity, though, they have the strained and complicated male/female clergy dynamic that has been going on within the Church pretty much since its inception. It should come as no surprise to even a casual observer of the Catholic Church that there is a definite hierarchy throughout the various levels of church leadership that is dominated almost exclusively by men.
Related to the general battle of the sexes and the church male/female clergy dynamic are the complicated relations within and between male and female religious orders of the Catholic Church (Jesuits, Carmelites, Dominicans, Franciscans, Augustinians, Vincentians, Benedictines, Irish Christian Brothers, French Christian Brothers, Marist Brothers, Congregation of the Holy Cross, Sisters of Mercy, Sisters of Providence, Sisters of St. Joseph, etc.). The unchurched/uninformed might assume that members of these religious orders should all be on the same page and pursuing similar agendas because, after all, Catholic is Catholic, right? How much different can they be?
The answer is very different.
They have very long histories of being different. Indeed, those differences are celebrated and cherished within those religious orders. They have different organizational/corporate structures, different formation/training, different charisms/spiritualities, and different traditions/rules. Men and women religious who belong to religious orders have spent many years working, worshiping and living communally within sub-communities OF those orders. It's what they know. It's their comfort zones, if you will. While few or none of them would likely admit it publicly outside of their own orders, I think that many/most of them believe, or at least feel, within their heart of hearts, that THEIR order is the truest and the best order. Some of them may even find it difficult or uncomfortable to communicate with those from other orders because they talk a different talk and have walked a very different walk.
To try to find a Protestant analogy, you have the various Lutheran organizational bodies (ELCA, LCMS, WELS, etc.) that are different. You have the Methodist Church and the African Methodist Episcopal Church that are different. You have the various different Baptist conventions. It's a somewhat weak analogy because the differences and traditions of many of the Catholic religious orders have been in place since well before the Protestant Reformation.
In more recent years, you have the other dynamic of women in general, and nuns/sisters in particular, calling out the Church for its male domination. Women don't like being subjugated/repressed by men and the men in the Church don't like it when the women call THEM out for the subjugation/repression. Catch, meet 22.
SO, you have all the above as important background to consider in the relations between the leadership of the Catholic boys and girls schools. On the part of the boys or coed schools sponsored by religious orders of men, I think that many of the members of those communities have certain feelings of superiority (conscious or sub-conscious) in their dealings with the schools sponsored by religious orders of women. I'm not saying that those feelings are justifiable, but I am saying that they exist. In the girls or coed schools sponsored by religious orders of women, I think that many of the members of those communities are guarded, at best (and suspicious/envious/vindictive at worst), in their dealings with schools sponsored by religious orders of men.
Personally, I don't blame the schools sponsored by women religious for the guarded, suspicious, etc. position they take with schools sponsored by religious men given the background I have tried to explain with respect to the battle of the sexes in general and the subjugation of women that has taken place in the Church forever.