I must admit to chuckling at similar comments from friends of mine about my 4th PG when I was talking to them but I knew they were said in jest.
Do you think it's said to stir or a bit tongue in cheek? I have certain friends (and rellies) who I can talk dirty too and it's all very light hearted so if it came from one of them then it wouldn't bother me. Others it would.

Definitely ask her what she meant by it and that it upsets you for her refer to you like that.