Thatβs not casteism. And people do misuse power. .. a lot of. irrespective of which caste or religion they are from. So if OP is worried that a person with grudge might misuse his power to hurt him, itβs not because of caste in but because of fear of misuse of power.
Also, if someone gets selected with low marks and other person tells them that you were selected due to low cut off.. itβs pointing on their poor performance not casteism. Casteism would be when the same matter is discussed with use of casteist words.