A sharp rebuke regarding Dong-ho's father's biggest problem

Even while being subjected to profanity, she did not respond with insults, but instead maintained polite language until the end, stating,
"Dong-ho's father's biggest problem is that he believes only he is right."
Fifteen years ago, he was branded a "fucking bitch," and now he is branded as a member of the "Mugeuk-pa" (extreme faction).
His sister-in-law's rebuke is clearly revealed just by looking at his SNS.
He claims he is implementing practical and effective reforms, and that anyone who disagrees is an irresponsible agitator.
If someone makes him feel bad, he brands them an agitator as well—
the typical behavior of an ultra-right-wing politician.