Rude cashiers

I am disgusted with how rude a cashier was with me. She takes her time time chatting to the customer infront of me, then takes her own time counting the money she was given. When it was my turn she abruptly says to me plastic. I said to her before you say plastic can't you atleast greet as I am a daily customer. She then answers me with an attitude that she did greet me. I don't have a problem rather doing my shopping at Shoprite or even Spar because their staff isn't rude.