She was doing this more for her, for grandstanding, than for your benefit, it sounds.
For the record, I have actually known Wiccans to harass Christians just as badly as some Christians do others. The young Wiccans received a tongue-lashing from me and a couple other "elders", believe you me.
I can understand the desire to not be ashamed, or hide, your religious preference. However, the reality of it is that, in many areas of the world, if you advertise the fact that you are a pagan, be prepared to receive such treatment on occasion. If you act surprised when it happens, you are being less than ingenious.
Does it suck? Yes. Does it indicate a lack of tolerance on the other party's part? Yes. But face reality. You live (assuming you're in the U.S.) in a primarily Christian country. You are going to have to accept such challenges if you advertise your religion by wearing your pentacle for all to see.