If they are intentionally leaving out the other person, yes. If they are unintentionally leaving out the other person, no. Although, if you are "telling them" what to do, instead of suggesting or inquiring, that may be trouble too.
Friends? Colleagues? Private or professional? ;) Helping or trying to show someone the error of their ways can be something good or bad, depending on the circumstances. If you want a more detailed analysis, you should add some more details! :)
