OP here... I have no idea why she hit me instead of asking me not to help and still haven't a clue as to what stereotype it was. I was waiting for my father to come out of the store when I noticed her crossing the street when she just dropped the bags I came to help and she swung whatever was left in the bag at me till I left. I lucky didn't get hurt but I was kinda humiliated but as far as I could tell no one saw. I got a laugh telling my friends at school though so either way it just another funny story to tell.