I remember when I was in college my roommate (a Christian) was being given a bachelor party. When they (other Christians) started showing a X-rated video I walked out. They later apologized to me, but it wasn't to me they should have apologized to.
I'm not suggesting that we become hermits. We should just ask ourselves why do we want to be identified with this world?
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Very good question. How does one be in the world but not of it? I freely admit I struggle with this as well. Some of us are old enough to remember a time where our culture at least paid lip service to Christianity and we had what Francis Schaeffer said was a “Christian consensus” even if many folks in the society were not individually Christian and would not claim to be so. As our cultural consensus seems to be shifting ever more and more to a secular and hostile to Christianity consensus, the “mushy middle” that many of us could live in is rapidly disappearing.