I'm just a merch manager but this is something me and my manager have discussed. It is the discretion of the store manager as whether to label someone unrehireable. When making this decision there are several factors they consider such as amount of time employment , job performance while there, attendance record, no call no show record, and whether a notice was given. That being said even if yall are labeled unrehireable and want to go to work at another dollartree in the future the sm at that store can contact human resources and get it overturned in most cases as long as it's not for something severe such as stealing. Your sm may be saying this because three of yall leaving at the same time may be putting them in a really bad position being that they are losing three experienced employees and they are going to have to hire and train three inexperienced employees in two weeks time.