If you're unsure about that, check out, of course, chapter three in the textbook, where these issues are addressed.

当然,如果还不确定,可以看看课本的第三章,这些问题都提到了

耶鲁公开课 - 聆听音乐课程节选

And you were unsure that it was offensive beforehand.

而事前你并不清楚这对客户来说是一件忌讳的事。

I didn't 课堂 - SpeakingMax英语口语达人