Why is "Ka'as l'Aviv Ben Kesil"?
Rashi: This is like Yaravam ben Nevat - he angered Hashem.
R. Yonah: Above, it says "Yoled Kesil l'Sugah Lo" (21). Here it adds that the reason for the father's anger, due to the son's dealings [with people]. The sadness begets anger.
Malbim: A Ben Kesil, not only does he sadden his father via going in the way of sin - he also causes anger via being Merer to the one who bore him. Her 1 Nefesh is bitter over his deeds. The father is angry about his wife's pain, or over [his son's] feud with her. "Havos l'Aviv Ben Kesil v'Delef Tored Midyenei Ishah" (19:13).
We fixed the text to say 'Nafshah' (PF).
What is "Memer l'Yoladto"?
Rashi: [He is bitter] to Keneses Yisrael - he caused them to sin. R. Yonah - Memer is more bitter than sadness and anger. The mother feels the Midos of a Ben Kesil more than the father, for the son fears his father, and does not go in the ways of his folly in front of him, like I explained "Ben Chacham Yismach Av" (10:1). The root of Memer is Merer; its grammatical form is like Meches - "va'Haremosa Meches" (Bamidbar 31:28).
