he behaves insultingly toward his parents
彼は両親に向かって無礼に振る舞う - 日本語WordNet
At that time, nobles thought with contempt that Ezo (northerners) in Oshu never knew any name of flowers,showed him an ume (Japanese plum) flower and asked insultingly what it is.
その際、奥州の蝦夷は花の名など知らぬだろうと侮蔑した貴族が、ウメの花を見せて何かと嘲笑した。 - Wikipedia日英京都関連文書対訳コーパス