Genki I - An Integrated Course in Elementary Japanese (3rd Ed.): When should you avoid using the れ series (これ・それ・あれ）of words?

Question

When should you avoid using the れ series (これ・それ・あれ）of words?

Alistair Lawrie · Accepted Answer

When using them in reference to people when within their earshot e.g. when introducing them.

How do you say When should you avoid using the れ series (これ・それ・あれ）of words? in Japanese?