I will share my experience, because it is very different
at my FSSP parish, I found much more community than at my home parish that does the Novus Ordo… maybe that is because the Novus Ordo parish is very big - certainly the priest there is very friendly and welcoming
but at the FSSP parish, - I was new and went downstairs for coffee and donuts after Mass, and I didn’t really know anyone, but a lady introduced herself to me and introduced others to me as well… I met some people my age and was invited to go to lunch with them. After every High Mass on Sunday, they would go to lunch, with the priests. I came on various occasions and found a great community there. My friends even made a goodbye party for me when I had to leave. One of our friends became Catholic at the parish, and everyone was very supportive. The priests organized a “Lent day of recollection” for all the young people, which was amazing, and they even made us dinner! the priests there put SOO much effort into the parish. They’re always available for Confession, there is Confession before every Mass, always available for spiritual direction or advice as well… there were other things going on, like we all went to pray by an abortion clinic, and went out to dinner on some Fridays after the evening Mass, etc…
I think it really depends on the parish! Mine had a great community, which I noticed right from the beginning, - even when I just went to the bookstore, people were very friendly there.
God bless