Coworker is being super rude about baby’s gender

So I’m 32 weeks pregnant with my third boy. I struggled with gender disappointment very privately till about 23 weeks and now am 100% excited for this baby boy and couldn’t imagine it any other way. I did not share this with anyone besides my husband and my sister, who I knew could relate and give some advice.

I have a coworker I don’t work with often, but EVERY time I do she goes on for a weirdly long time about how disappointed she is I’m not having a girl. Like “ugh I can’t believe it’s a third boy. We need a girl. I mean I’m sure he’ll be a healthy baby boy but it’s not fair.” For like five minutes. I have zero issues telling her to stop, because for the next day I am mildly upset about it and want to say something for myself, but I legit have no idea what to say. I just want her to know that’s not okay and I’m not okay with it. If it was one time whatever. But she catches me off guard every single shift that we share by saying something, despite my pretty obvious discomfort. I don’t think that’s an ok thing to say to begin with, but I barely know this person. My baby’s sex affects her in no way whatsoever. Pls stop saying my baby would be better if he were a girl.