Disclaimer: this isn't about people who naturally gravitate towards bgs or ggs but ones who purposely/make a point of only stanning/listening to one or the other. And this isn't meant to be an attack on the people in question either
Honestly, I find it confusing. I don't understand how an entire gender's music just doesn't appeal to someone or that someone just flat out refuses to listen to it. I've never seen it outside of kpop which makes it even more strange for me. As someone who usually prefers gg music and mainly listens to them, I like a lot of bg songs and even stan one too because both genders offer good music. It's not even like disliking an entire genre of music (still strange to me honestly) where you could at least argue that there could be a common enough musical trait for someone to dislike it as a whole. It kind of just comes down to the gender of the singer (and maybe thinking that gender offers something better) and you can even see it through how SOME of the stans hate so hard on the other gender groups
Even if it's explained as only wanting to stan/interested in people you're attracted to, I find it confusing and frankly a little shallow (ironic because it's the idol industry but whatever). I think regardless of your sexuality, both bgs and ggs have something to offer through music, talent, and/or personality. I admit attractive women might interest me in a group more at first but limiting yourself to only what you're attracted to makes you miss out on a lot. It would be weird to do that in any other form of entertainment like only watching movies/shows with people you're attracted to, only listening to non-idol singers you're attracted to, only watching athletes you're attracted to, etc.
What do you think of these types of bg/gg stans? And if you're one, give me some insight why you purposely only stan/listen to one gender? I'm going to sleep now.