IMO the healthier attitude, rather than seeking out things you don't like, is to leave yourself open to things you don't like, particularly in a group setting. It's very annoying lately, my group of friends wants to play video games after work, but everybody has some kind of game type they don't like that makes it hard to reach consensus. Rather than being in constant pursuit of optimized personal pleasure, it's important that I sometimes just play the games I don't like so in the future they'll play the games they don't like with me. And then maybe by chance one of us actually will end up liking it despite ourselves.
There's another layer here as well as to the scale of things. "I don't like EDM" is a very differently scaled statement than "I don't like Music". When confronting your own preferences, I think it's important to compartmentalize them appropriately. I identify myself as someone that likes anime, but I will never watch another shonen sports anime again willingly.