The most effective way to deal with cheeky people is to explain directly. For example, if he asks you to help her lift the stool, you say I'm not available, or you can't lift it yourself? Pretending not to understand what she said, of course, thick-skinned people must hurt their self-esteem. In fact, thick-skinned people are not easy to hurt their self-esteem. You think you hurt her. Actually, she's not hurt, and she won't bother you again.