In my personal experience with 90% of my irl friends being into the scene, it's a 50/50 ratio when it comes to the music. BUT must guys I know who like VK are also into girl bands such as Band Maid or Scandal and/or female vocals like Fuki, whereas the ratio of women into female vocals is, in my experience, way smaller.
When it comes to posting appearance-related content I see far more girls fawning over VK dudes than men. When it comes to collecting CDs/merch I see much more men into it (yet I see more girls collecting cheki, overall). I'm leaning towards saying most men are firstly into the music/overall performances and it's harder for them to stan a bandman just on looks, while MANY girls are mainly into some dude's looks and don't care much about the music (I do see this reflected in Japan fans rather tan overseas fans, but still).
I'd say VK IS marketed towards teenage girls the same reason Idols are marketed to appeal to the average Japanese man, but when you are overseas and not actively going to gigs/events I'd say it changes a bit and I wouldn't say men in the west feel they donmt belong in the Vk scene or are uncomfortable in it the way men in Japan might (as far as I've read here, many prefer to remain internet fans).
I also feel LGBT+ people relate to VK on a bit of a deeper level than cis/straight people. BUT this is only a personal perception based on people I know, can't speak for everyone here.