O Partha, the king believes that this immoral Karna is unbearable to everyone else on earth but you. It was this that enraged him so highly as to use such cruel words even in your face.
जानाति तं पाण्डव एष चापि पापं लोके कर्णमसामन्यैः। ततस्त्वमुक्तो भृशरोषितेन राज्ञा समक्षं परुषाणि पार्थ॥