I used to be Bi, but I recently found out I'm Pan.
The only thing I hate about telling people is that they say it doesn't exist as a real preference, and every time I tell them 'well I have no real care for what people have down under and Bi/Gay still deals with what they prefer down under...so what would you refer to me as then?'. Unsurprisingly, those people still believe I'm Bi to this day and it's annoying but I've basically given up on it now. And I've heard every joke in the book about being Pan, from doing it with literal kitchen utensils to being a furry (seriously wtf those are two completely different things how did you connect the two in your mind?). The best I can do is just laugh and try to educate those who have no clue on what being Pan actually means. And I really don't tell people I'm Pan, it's really not my place unless they ask about it.
Sorry you have to go through that. I'm also Pan as well as polygamous and though people try to be nice about how they say it, they often basically imply that I just don't know what I want or that I just can't commit to anyone lol. People who can't understand that Pansexuality is real probably aren't worth talking to about your preferences anyways.