If someone is being bothersome just politely ask them not to cut through your site as you prefer your privacy. If it continues then I would suggest talking to the camp host or superintendent.
It can be quite the problem if you are camped close to an attraction. Usually it is kids running to the beach or bathrooms. If it is kids you may have to tell them more than once, LOL, just don't swear or be rude or you may have a whole family coming over to settle things.
We try not to let it bother us unless they are too close, have bikes, or are noisy. I notice that a lot of sites are smaller and closer to one another than here. I see that as being an issue.