Spar security guards useless

The security guy told us we can’t come in with our school backs and we politely asked him to search our bags when we leave the store Coz I told him am not leaving my bag at the parcel counter. I don’t think there is a different between a handbag and a school bag... and he just told me to leave the store if am not going to listen to him. I left the store coz I can’t risk leaving my bag with a laptop on a parcel counter that doesn’t even close that is visible to anyone who comes in