BC school spirit is mostly of the “bandwagoner” variety. Most of the students come from NE and NY/NJ which are professional sports regions. College football is not really part of the culture in these areas. There are many BC alums in the Boston area who support the football and basketball teams, especially against “name” opponents. Beanpot hockey is also well attended. Very few people in the area (outside of BC alums) support or even care much about BC sports. In this way, BC spirit is much lower than ACC peers, where football and basketball is always a big deal, even when the teams are mediocre or worse.
If you are looking for a school with similar quality academics and strong school spirit, try Notre Dame, Duke, Michigan, Villanova (hoop only), UNC or UVa.