I personally don't think it's weird, but I dunno about "rare" though. I used to hang out with boys a lot when I was younger, but they all moved away and now I seem to befriend cis girls more than anything. I haven't come out yet to them, but I know two of them don't mind at all. I don't tend to hang out much with cis boys now because (at least the ones around here) are all the sporty type and I'm more of the reading, geek type. The couple cis guys friends I have hang around because of common interests (gaming, art).
So really I think it comes down to whom you deal better with. If you want to hang out with girls, go right ahead! I don't know why that wouldn't be socially acceptable.