Good lord the discourse here is about as well as the man or bear discussions.
Something I notice is how everytime someone makes these kinds of criticisms, the counterarguments turn into a pit of semantics and extropolations. As if the original post was a massive research thesis rather than just women venting frustration over the entitlement and danger they're subjected to daily.
You gotta look past the specific wording to see the overarching societal themes, emotions, and issues. It's like those magic eye pictures.
Basic answer: Bi likes two and maybe more, where Pan explicitly likes any, which you use just show's your starting point.
Real answer: Those who resonate with using Bi as a label likely started or wants to start on a common level of understanding of LGBT, whereas people who resonate with Pan start deep into LGBT discourse.
True answer: It's which flag you like better.