The phrase "poor taste" refers to something that is considered offensive, disrespectful, or inappropriate. It means that the particular thing or behavior is socially not accepted or morally wrong. Full definition
Her e-mail (while — I think — was in poor taste even as an atheist) was a private e-mail from a private account to her friends and family. (religion.blogs.cnn.com)
This not only very poor taste, but it violates the child's right to privacy. (pairedlife.com)
Be careful, some of his games are in extremely poor taste! (pcgamer.com)