passive agressive behaviour from a store lady today concerning the store app

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at first, i thought apps would be fun but many stores make their apps complicated, i feel. on one store app, you just have to scan your card and if there were coupons included, you don't need to activate coupons seperately while on other, you have to. also, many self-checkout won't acnowledge this card or some coupons which happened to me today in one store. first two times during this year, they didn't acknowledge my card and i was left without coupons. okay, i accepted it while this time, app's card was accepted but not the coupon so i went to the most awful place, info part where there is mostly noone there or they ignore you and all sort of situation and today, i even have to speak louder with excuse me so they notice me so i could pay the difference that coupon will let me and not the full price. the store lady came and i explained to her but she was maybe not hearing me well which product i need though i had a product on a counter with me and on the app as well, with a photo.okay, i was trying to be patient and then she said that it's all okay with her system and was surprised how my coupon didn't go through. i said okay, but not in my case and i felt like i had to justify myself, which i didn't like. i felt bad and i said that this shouldn't be happening, that i feel not good about this and she should report this and then her attitude started. she said "we already did" and i kept my mouth shut but this was making me angry and i added "well, not every customer is the same and she should report it again " and she said that she can tell. this second part, cause i was tired of facing her and talking to her, i noticed it when it was already done and how sarcastic she was and passive aggressive for sure. there was also another customer that waited behind me and i feel she made this slow on purpose; she slowly found some paper and then she acted like she is helping me out, saying that she crossed out this product and she said goodbye. no sorry, no nothing. and yes, at the beginning, she said it's not her job. i said it is. i thought, you represent your company, not yourself and i regret not saying that aloud. Also, she was older than me. i experienced many times when you're younger, they toss you around while when a man comes or an elder person, then they humble themselves. double standards and i hate that. i deleted the app but then i thought of a store's winning contest and i installed app again but i won't be going to that store for some time.my entire week consisted of sending emails about things that i shouldn't do and i wanted to come to mylot site 3 days ago but i was tired and then i would expect some goodness outside and no, there isn't any.