Like, are there jocks and cheerleaders walking round hallways in full gear? Do you attend big rallys when the school football team are having their big game? Etc
I've been dropping kids off at an upper class public high school in the Midwest for.....geez, 6 out of the last 7 years now. Football isn't HUGE, but it's kind of important. On game days during the season most players wear their jersey (my son did). Some of the girls wore their cheerleader gear, but not the ....ummmm....oh boy, how do I word this.....errrr, the typical "sexy" cheerleader outfit you are picturing in your head. I think there is a "rally" for the Homecoming game, but not 100% sure on that.
"jock" culture, in my experience at least, doesn't exist like it does in TV and film, but most of the high schools I have experience with haven't been that big into sports either.