are readings in school like.. not accurate

my friend has been getting really angry at me over the past few days due to doing tarot in school since apparently in can pick up on negative energy around you or wtv but like.. wouldn’t that make the cards not work ANYWHERE if thats the case. They got specifically mad at me yesterday and was talking abt how if im not gonna use tarot correctly them they dont wantme using it in their house at all and im so so confused..