His tie is in bad taste.
I think that flashy decoration is gaudy.
nastiness; perversity
Describes a person's character or behavior as nasty, mean-spirited, or perverse, often with a sense of moral repugnance.
I'm fed up with his nasty jokes.
I can't forgive such perverse behavior.
下品 means 'vulgar' or 'crude' in a general sense, whereas 悪趣味 often implies a more deliberate or perverse bad taste.
Compound of 悪 (bad) and 趣味 (taste). The word is transparently derived from its components.