What do you think about me telling a regular customer that he smells bad?
Why would you want to hurt someone like that?
I don't always want to tell him, but I'm in a pretty bad mood.
I think that that is just going to come across as rude. You should not tell someone they smell bad, unless you are ready to deal with the consequences.
I really just think he smells bad, and he should know. He honestly looks pretty awful too.
I can understand you wanting to let him know, especially if you're in a bad mood but it's not really your place to do so. You don't know him well and it really would just come across as being rude.