应该是bad manners
1. It is bad manners to interrupt.
打断别人说话是不礼貌的。
2. It's bad manners to ask other's salary if you are not very familiar.
如果你们不是很熟的话，问别人薪水多少是很不礼貌的。
3. It's bad manners to whisper in company.
当著别人窃窃私语是不礼貌的行为.
4. His bad manners grate on my nerves.
他没有礼貌让我心烦.
5. It's bad manners to fidget about (with the cutlery) at the table.
用餐时摆弄刀叉玩儿是不雅的.
参考资料：http://dict.cn/search/?q=bad+manners&r=a+bad+manner