Insensitivity

So I had to go to the OB-GYN today... surrounded by pregnant women. But to add insult to injury the tech who brought me back and took vitals was so... insensitive I guess is the best word for it. She asked the "how many pregnancies, how many children" question and when I said none she proceeded to tell me how smart I was not to have kids and no wonder I didn't have any because I was a teacher and had to deal with kids all day, etc. I didn't know what to say, how to interrupt her and tell her it wasn't by choice, that I just wanted her to stop telling me how lucky I was. I know she didn't mean it, but it hurt. Most of the time I can handle my infertility but how can I handle insensitivity?