Just received the worst customer service from the ...

Just received the worst customer service from the front desk associate she was very rude and unprofessional. My mother and I went to get a couple small things she went in maybe 10 seconds before i did while i was looking at the plants they had outside. When i attempted to go through the gate the lady checking cards who failed to check my moms promptly asked me for mine thats when i told her that my mom had just came through and she was the one with the card she then proceeded to be very very rude and in a high pitch mocking voice said "oh your mom has the card?" "does she have a bi-mart card" laughed mockingly to her co worker and then let me in. all while giving me this very very rude look while i walked through. i asked to talked to a manager but i dont feel like that was going to go anywhere definitely will not be going back. worst customer service all because of a rude untrained mocking associate.