I'd say being neutral is best (about stuff that you don't like that doesn't directly affect you, not stuff like her getting a Skrillex) is the way to go. Why spark confrontations over tiny details? You wouldn't do it with a stranger, friend or a family member, I don't see the need to do it with a GF.
"Imagine" by HCE | Hitler reacts to Battle of Montreal | An alternative use for squid that has never crossed your mind before