Oh, I missed your post for some reason, Lauren...yeah it seems like people are being jerks, you are clearly presenting as female there. Any chance they'd know you from other days, like have there been days you presented as male or androgynous? People remember these things for some reason.
In any case, people will give you less hassle after more time on HRT. You already look very feminine, but I've noticed big changes in a lot of girls over the first year or two and people stop misgendering them.