I think people, including me, make the mistake of thinking that this is going to be "their" community and that there is going to be some Nirvana. That because they are in a private school, especially Catholic, that people are "better" - not rude, not clicky.
Catholic/Private schools are just filled with people - good and bad.
I started at a Catholic school, 7 years ago and I hated it. But after a year my oldest son made friends that he will have for life. He loves these kids and their families are great. We navigated the "people issues" and found a great group of people who are good friends.
I find that parents really have to make an effort to find common ground since they are not necessarily neighbors. We happen to do that with sports and wine.
4 years ago we found out - educationally - this school was terrible for my son - terrible. Though the school was willing to do "accomodations" we decided not to square peg/round hole it and left.
We discussed at length with specialists the best school for our son, private, public, independent, etc. It is incredible how much I learned and how every single school (even public schools ) are very different.
We moved schools and we are super happy. We still play sports with his friends from the old school.
I would not "stick it out" but I would not "jump ship". Maybe you know somebody that goes there that you can voice your specific concerns. What are your specific concerns?
Unfortunatelly there is no one size fits all answer.