It might be just because I'm relatively middle of the road bisexual, but I always liked the idea that most people aren't quite on the extreme ends of the Kinsey scale, but like, a tiny bit bi at least.
I am definitely thankful for having a family that was very open about everything, and didn't mind either way, though I do feel that the years spent not wanting to engage with the thought partially came down to pressure from peers, as anything other than heterosexuality seemed to be seen as alien back then. From what I hear from my brother, that actually changed a lot compared to when I was in school, and things are a lot more accepting now.
Or it's just the way they pronounce it, and want to give their cursing a bit of flavour.