To me, shared experience is always an easy ice breaker. Stuff like mainstream media is a quick win. And yeah, sometimes if people are a bit more underground or indie as far as their media is concerned grants them an image of having a distinct personality, but that usually only works if they're socially strong and have other stuff they can connect with other people over.
I'm not saying you should consume anything that gets promoted massively, but keeping an eye on what's popular and seeing if anything floats your boat might give you an easier time striking up a conversation with someone.
I used to be really dismissive of anything with a huge advertising budget. If something gets promoted everywhere all the time, it's unlikely I'd give it a chance. Somehow I felt more interesting than others because of this. Turns out you're not, people lose interest really quickly when they can't talk to you about anything.