I'd put you in the sheltering category as well, but that's just because I don't censor my kids from tv/movies very much. That said, I don't say that in a judge-y way at all, because I certainly have tons more respect for parents with lots of rules than I do for parents with none. You're looking out for the best interests of your child, how can you go wrong with that? You probably didn't know how to respond because that was so blatantly RUDE!
I let my kids watch stuff on TV that they probably shouldn't watch. The other day, my husband & I were watching a rerun of Grey's Anatomy, and it was the episode where this guy with a gun goes around the hospital shooting people. It's kinda scary. My kids saw some of it. My 8-year-old scares easily, so she ran away when she saw it, but my five-year-old loves stuff like that. She's also watched Interview with the Vampire, and has asked repeatedly if she could watch it again. My husband and I question our judgment letting them watch that garbage. But we do talk to them, they know that what's on TV isn't real.
My parents did me and my brothers the same way, we could watch pretty much anything. Didn't ruin us.
But again... rude of your coworker to make that comment!!