Premanand Maharaj Ji
Can I be firm or angry with someone without hating them?
Correct without hating
When someone must be taught so that they understand properly, showing anger is not an offence. But do not hate that person, and do not hold ill-will (dvesh) toward them.
So we may show anger in that case, and that is no offence. But we will not hate that person. We will not hold ill-will toward them.