I just want to add that gender preferences are a thing with pansexuals as well. I'm pansexual and I generally find myself being attracted to girls more often than any other gender. So it's not a complete disregard for gender.
Here's just a few pride flags. There are soooo many sexualities and genders besides this: demisexual, agender, polysexual, and gender fluid just to name a few. It's a spectrum, not a few choices. There are also different flags for romantic attraction.