And why is it an "umbrella term"? You're either are or are not. This vague and unspecified bisexuality+ garbage dilutes the identity, and paves the way for posers and sidlers. It's like what Paula C. Rust talked about in her book. If you stubbornly refuse to define your own label to appear "openminded", "inclusive", and not offend the emotionally unstable, someone else(opportunists) will do it for you. And then everything they do or say can be sloughed onto you.