It's inconsiderate to laugh at other people's bad haircuts.
John is at work when Carol, a coworker, arrives with a new and ugly haircut.
John wants to react verbally to the haircut.
John tells Carol that he notices she got her hair done without saying what he thinks of it.
John tells Carol that she looks ridiculous and that it's making him burst out laughing, and he can't help himself.
Carol assumes John likes it and is happy to have someone notice that she has a new style.
Carol is embarrassed by John's comments and begins to cry at the office.