Dollar Tree review: misty being very disrespectful and rude

My mother and I went to the local dollar tree as I always do for I buy all of my wreath making supplies there. I have NEVER had a bad experience there until a new person started working there the name tag said Misty. While my mother and I were next in line in her check out where hers was the ONLY one open while there were 15+ people behind us "misty" produced to make the comment "hold on while I call my manager to come check some people out because I get paid to be nice and sometimes it's hard. I have an issue with some people in line" reducing to check out my mother and I we pack up our CART full of things 50$+ worth of things and move past everyone in line and proceed to the next lane. No apologies were said by the manager or misty.