To be fair, my alma mater was nowhere near as snobbish as the stereotypical rich kids' boarding school. In fact, I saw a lot more spoiled brats in college than I did in high school and they were quite disgusting. There were very little of those privileged rich kid snobs and most kids seemed laidback. It wasn't a posh school at all compared to other Catholic schools in the area, but it does carry a great reputation nonetheless. Most kids came from really decent families, who like I said had some tradition in bringing their kids and their kids' children to said school. This is why I wouldn't classify it as a typical "old boy network" because when you graduated, there wasn't anyone pulling the strings for you to get favors.
The problem lies in most of them sticking to cliques of friends they knew back in childhood, also from the same Catholic school. Most of them took their cliques too seriously and ran around like they were tough, like they owned the joint. Then, you had alumni who came back as teachers to the alma, and there were plenty of them. So, if that teacher knew your family and was in good standing with them, you got preferential treatment. There were two things I feared most about high school, then and when I was in college: 1) marrying someone I knew in high school, especially if it's into one of the "traditional" families or has ties to them and 2) becoming a teacher at the alma, which for some was a telltale sign that you failed miserably in life.
A very close friend of mine and I were reminiscing about high school over a few drinks at the local pub, as we normally do. He got his invite as well and the more we talked about high school, it reawakened some memories of high school that really pissed me off. They were forgotten memories and hence why they've been forgotten all this time.