Bah I'd say get a new BB card or use a friend's and go to a different BB store, not like they are scarce. Probably dealing with that pinhead will be like the proverbial teaching of the pig to sing: it will accomplish nothing and only madden the pig. If there are anti-discrimination laws in your state/area you could build a case, but then again, in regards to trans discrimination she will have the upper hand.

*hugs* that really sucks sweetie, glad it's over