In a manner that is unpleasant, offensive, or showing clear disapproval and disgust.
From 'distasteful' (dis- + taste + -ful) + '-ly' adverbial suffix, creating an adverb form of the adjective.
When someone acts 'distastefully,' they're making their dislike so obvious that it becomes offensive itself—it's not just disliking something quietly, it's expressing that dislike in an ugly way.
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