וַיַּ֣רְא עֵשָׂ֔ו כִּ֥י רָע֖וֹת בְּנ֣וֹת כְּנָ֑עַן בְּעֵינֵ֖י יִצְחָ֥ק אָבִֽיו׃
以掃又看出，他父親以撒不喜歡迦南的女子。
Siftei Chakhamim
So that I will not grieve my father... Although he was wicked, he would never grieve his father. He treated his father with honor, as proved by (28:8): “Eisov realized that the daughters of Canaan were evil in the eyes of Yitzchok, his father...”