Karna said O Shalya, the meritorious only appreciate the merits of those who possess them and not one who has none. You are destitute of all merits. How can you understand what is merit and what is demerit.
कर्ण उवाच गुणान् गुणवतां शल्य गुणवान् वेत्ति नागुणः। त्वं तु शल्य गुणैर्हीनः किं ज्ञास्यसि गुणागुणम्॥