If I don't know them/ don't care to know them/ similar situations where I basically don't feel like talking, I'll say, "I'm pansexual. I like everything."
If I'm somewhere where I feel like sexuality/identity politics is understood in a critical way and don't feel like talking, I'll probably say, "Queer."
If I'm writing an essay or really want to explain myself well to someone/ am up for it, I'll give them a very lengthy rant about my wrestling with mesophilia, graysexuality, autosexuality, demisexuality, lesbianism, queerness, and pomosexuality. And my difficulties with romance--- considering identifying as aromatic, demiromantic, panromantic, despite whatever contradictions that may imply.