Smelly People

We have this guy at work, I have told you about him before, Thanksgiving glutton, who seems to care very little about his B.O., or breath. He got into work today, went directly to our supervisor and started talking to him. I witnessed a nice, normal colored skinned face, turn this ugly green color. This is not the first time this has happened, nor is it the first time he has been told about it. How can a person be told, time and again, they stink and they need to bathe more and brush teeth more, but still not do it?