a strong feeling of disgust or upset following an experience
The incident with her left a bad taste in my mouth.
used with "in (someone's) mouth"
As reported by LDSliving.com, Sue Perdue says, “It would be like dressing up as a Muslim—I think it would be in bad taste.”
Our obsession with the suits, the ties, the schools, the wives and the debates now leaves a bad taste.
And the entire experience, he says, left a bad taste in his mouth.