<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
How do I tell someone I don't want to be friends because they smell?
<|assistant|>
Honesty is always the best policy. You could simply say to them "I'm sorry, but I can't be friends with you because you smell." It might sound harsh, but it is honest and to the point. They may take it well or they may be hurt, but you will be doing it in the best possible way.