I’m not saying I agree with this mindset, but I’ve seen that most people would just call someone who is pansexual, gay. Especially someone who would be inclined to say what they said to you. I also will say that someone can’t possible know that you’re pansexual without it being specifically mentioned, however may have seen you doing something with someone of the same gender, and just assumed you were gay. Again, not saying that’s the right thing to do, and I feel I shouldn’t have to specify this but I’ve been shit on numerous times before for even trying to bring this nuance up.