Are my sisters right? (Details in post)

I’m 20 years old and in college. Me and my BF live in the same city but in different parts about 30 minutes s from each other. He’s also 20 and we dated since 18 years old. I live with my brother while he lives with his parents. I’m too lazy to drive through traffic and like to see my boyfriend throughout the week so I sleep at his house a couple times a week. Like maybe 4 nights or so. He lives like 10 minutes from my college.

My sisters who are 28 and 33 says that it’s rude for me to sleep over there when he still lives with his parents. They keep telling me to stop doing that, to just drive home. I think they are old school and it’s not a big deal. What does everyone say? Sisters right?

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