be in bad, the worst possible, etc. taste

be in bad taste

To be offensive or inappropriate (resulting from poor judgment or a lack of standards by the person who said or did such things). Some people thought that wearing such a bright outfit to a funeral was in really bad taste, but it was meant to be a tribute to my friend. Your use of those words was in bad taste, to say the least.
See also: bad, taste

be in the worst possible taste

To be highly offensive or inappropriate (resulting from poor judgment or a lack of standards by the person who said or did such things). Some people thought that wearing such a bright outfit to a funeral was in the worst possible taste, but it was meant to be a tribute to my friend. Your use of those words was in the worst possible taste. I can't imagine something more offensive.
See also: possible, taste, worst
Farlex Dictionary of Idioms.

be in bad, the worst possible, etc. ˈtaste

be offensive and not at all appropriate: Most of his jokes were in very poor taste.
See also: taste, worst
Farlex Partner Idioms Dictionary
See also:
  • be in bad taste
  • be in the worst possible taste
  • in bad taste
  • in poor taste
  • poor taste, in
  • taste
  • bad taste
  • OOTD
  • outfit
  • excuse my French