It's absolutely disrespectful to "admonish" someone in a meeting like this. I mean, it is basically saying "you are making shitty choices." If you were a friend, that's another matter. I'm still trying to back the idea that there should be a civil barrier of respect that is not crossed in formal dealings. If someone is dealing with you in a capacity that their job demands, you should treat them as a person in that capacity. They don't necessarily want to be there, they must be. The last thing you want is for people to get personal. I'm obviously not just talking about this situation, but the way we conduct ourselves in general. It makes navigating society much easier when people respect these boundaries.