Where you looked it up was wrong. AC/DC and bisexual means someone who sleeps with men and women. That is not what gender fluid means. Gender fluid means that the person could sometimes feel like/"be" a woman, a man, some other gender/s, or a mix at one time.
You’re right. I went back and did another search. Thanks. Glad I’m not up to date on this stupid crap. I prefer being ignorant about it. We had none of this crap when I was a kid in the 50’s. You didn’t even say the word “queer” in public back then. Now the morons want to be called that.