insultingly

/ɪnˈsʌltɪŋli/
adverb
  1. In a way that is rude, offensive, or shows a lack of respect.
    • He spoke insultingly to the waiter, which embarrassed everyone at the table.
    • She rolled her eyes insultingly when he tried to explain his idea.
    • The offer was insultingly low, considering all the work she had done.