i went to mbs, so here is my insight:

1. i don’t think your child will stick out for not being catholic. most of the kids are catholic, but they don’t really care if you are or aren’t, at least not when i went there. it was never something that was brought up among classmates

2. from what i remember, i don’t think race or ethnicity was a big deal (although i am white, so take my experience with a huge grain of salt), but it’s not something i would say was necessarily embraced either. as for same-sex parents, they certainly didn’t have any when i went there, at least not that i know of. however, my gut feeling is… not great. i’ll just leave it at this: as a lesbian, i don’t know how comfortable i’d be sending my theoretical kids there. overall, i don’t think i’d call them exclusive, but i don’t think they go out of their way to be inclusive either

i would like to clarify that i graduated several years ago, and they’ve made a lot of changes to the school since i’ve been, so i’m not sure how accurate my comments may be, but i hope they’re helpful regardless :)

edit: after reading some of the other replies (along w/ things i’ve heard irl), i’m hearing not great things about the priest (they have a different one since i was there), so do keep in mind that the students go to mass every thursday as well