Its like no logical input since at all, it's always make an accusation toward MC chastise, and provoke a confrontation into fight with MC.

i don't understand the need to fight each other tbh

This is a common cultivation story trope. The reasons are usually a combination of arrogance & stupidity and occasionally treachery in that an insider does not wish for the lady to be cured for...reasons. Or someone is hoping to get access to the treasure reward knowing that they can't cure the lady.

thx for the answer

MC would be like “anyone else want to taste my knuckle sandwich “ .